## I write, therefore I amWith this variation on a famous statement by the philosopher Descartes, I would like to express that the act of writing about what happens in my life is important to me. | |||

## Friday, July 14, 2017## Link## Tuesday, July 11, 2017## Links- Pentagon Tiling Proof Solves Century-Old Math Problem
- Exhaustive search of convex pentagons which tile the plane by Michaël Rao
- An aperiodic set of 11 Wang tiles
## Sunday, July 9, 2017## Gerrit Rietveld AcademieI went to Amsterdam, where I arrived at the central station at eleven. I took some metro's and after I short walk, I arrived around a quarter to noon at the Gerrit Rietveld Academie to look at the finals exhibition of this year. I stayed there till four in the afternoon. I found the following students with their work worth mentioning (in the order that I encountered them):- Mika Yamakoshi: I had a nice talk with her. Meet the students: Mika Yamakoshi, Jewellery.
- Emma Kroos. Saw her works
*Oneirism*and (later)*Floating*. - Elfi Seidel with
*Languages of the sky*. - George Tsiongas with
*SUBsPACE*. Performance, 24 hours in 5 parts. Performer: Hanna Monola. I found this very impressive and returned several times to watch it. - Linnea Langfjord Kristensen.
- Sophi Serber with
*Stich and colour*. - Einar Limi with
*A Dark Efficacy eating away at the Legible*with some very interesting paintings: both abstract and figurative in a sense. - Tiziana Krüger
- Nikola Lamburov with photographs. I says: "For me photography is violent".
- Flore Kueter.
- Romy Yedidia with
*The Beauty Machine*. - Frédérique Albert-Bordenave with
*Robot: Anywhere but here, anytime but now*: A robot with a light moving around an object casting shadows on walls, floor and ceiling. - Aurélien Potier with
*it used to be something else until it wasn't*: photorealistic paintings. - Hilde Viëtor with
*ROOM*. - Dominica Chen with Superpower Studio.
- Sanna Bax with
*A Neatly Manicured Hedge*. - Anouks Beckers.
- Annabelle Binnerts. I found her Atlas very interesting.
- Noé Cottencin with an interesting wooden couch/bed.
Afterwards, I visited bookshop Het Martyrium for about a quarter of an hour before closing and Scheltema, where I looked around for about one and half hour without buying anything. On the way how, I saw two sun dogs with a rainbow pattern. I took a picture. When I biked home from the railway station, the sky turned red and I stopped to take some pictures of which the last turned out to be the best. ## Wednesday, July 5, 2017## BookAt 17:56, I bought the bookThe Game: Undercover in the Secret Society of
Pickup Artists written by Neil Strauss in English and published by
Canongate in 2007,
ISBN:9781847672377, from charity shop Het Goed
for € 1.95.
## Tuesday, July 4, 2017## Link## Monday, July 3, 2017## CataloguesWhen at charity shop Het Goed, one of the people working there, when I was looking at the art book section, pointed out that there was half a shelve of catalogues (all rather thin, more like large flyers) from Stedelijk Museum Amsterdam. As it was close to closing time, I was not able to scan all of them. I found three catalogues related to Peter Struycken. I found one of which I was sure that I already have and two that I was not sure about. At home it appeared that the one that I thought I might have, I did not have, and the one that I thought that I might not have, I did have. At 17:52, I bought the following two 'catalogues':*p. struycken*published by Stedelijk Museum Amsterdam in 1967 for € 0.95.*Nederlandse inzending Biennale Sao Paulo*written by Edy de Wilde and published by Stedelijk Museum Amsterdam in 1968 for € 1.50.
## Link## Sunday, July 2, 2017## Link## Thursday, June 29, 2017## NecklageI have been working on the 'necklage' solutions for the Irregular Chocolate Bar problem. The necklage solutions are the solutions with 2n-1 numbers. Let S be the sum of all numbers of a
solution, than for a necklage solution the number S/n must be
included and there must be n-1 pairs that add up to S/n.
Furthermore, one can reason that there must be n-2 pairs and one
triplet that add up to S/(n-1). All the pairs of both groups
form alternating chains. One such chain connects the S/n number
with the triplet and the other chain connects the two other numbers in the
triplet. The could be viewed as a necklage with a 'triangle' in the front and
a piece hanging down. Hence the name of these solutions. I adapted the program
and it found the solutions shown below. I let it run for higher numbers as
well, but it did not find any solutions that also had a division for numbers
between 1 and n-1. There are good reasons to believe that these are
the only necklage solutions. In the listing the minus sign is used for pairs
that up to S/n and the equal sign is used for pairs and triplets
that add up to S/(n-1).
3: 2-4 6= = 1-5 4: 4-5 5-4 1-8=4 9=3-6= = 9=3-6= = 9= - 2-7 1-8 2-7=5 5: 2-10=5 1-11=4 1-11=4-8 12=3-9= - 12=3-9= - 12= = 4- 8=7 5- 7=8 2-10=5-7 6: 3-17=7-13 1-19=5-15= 9 20=4-16= = 20= - 5-15=9-11 3-17=7-13=11 ## Saturday, June 24, 2017## Museum Boijmans Van BeuningenDuring the afternoon, I visited Museum Boijmans Van Beuningen. I first looked at the main exhibition, curated by Carel Blotkamp with the new lightning designed by Peter Struycken, which he made in an attempt to approach daylight as good as is possible. To my surprise, I ran into Wim T. Schippers again. At two, I attended the official opening on the small sqaure in front of the entrance of the museum. The sky was grey and there was a little rain. After this, I also walked throught the other exhibtions:Sensory Space 11, Richard Serra,
Drawings 2015-2017, The Magnetic North & The Idea of Freedom,
and near the end of the afternoon, after having walked throught the exhibitions
again, Gunnel Wåhlstrand. I listened to the talk by Carel Blotkamp
about his work as a curator of the main exhibition. The list of noteworthy
(to me) works I saw is:
- Pyke Koch,
*De schiettent*, 1931 - Salvador Dalí,
*Couple aux têtes pleines de nuages*, 1936 - Salvador Dalí,
*Table Solaire*, 1936 - René Magritte,
*La reproduction interdite* - Piet Mondriaan,
*Componsition no II*, 1929 - Piet Mondriaan,
*Composition with colour fields*, 1917 - Kees van Dongen,
*Le doigt sur la joue*, 1910 - Charley Toorop,
*Drie generaties*, 1941-1950 - David Salle,
*The Greenish Brown Uniform*, 1984 - Keith Haring, Untitled, 1982
- Cindy Sherman,
*Untitled #258*, 1992 - David Salle,
*The Desert Wind of De Construction has not Touched a Hair on My Friend Julian's Head*, 1980 - Odilon Redon,
*Les rochers (Rochers en Bretagne)*, about 1875 - Odilon Redon,
*Rue de village*about 1875 - Camille Pissarro,
*Les Coteaux d'Auvers*, 1882 - Claude Monet,
*La maison du pêcheur, Varengeville*, 1982 - Claude Monet,
*Printemps à Vétheuil*, 1880 - Vincent van Gogh,
*Poplars near Nuenen*, 1885 - Anton Mauve,
*In de Moestuin*, 1887 - Peter Struycken,
*Komputerstrukturen 4a*, 1969 - Armando,
*Zesmaal rood*, 1963 - Sol LeWitt,
*Floor piece no. 1*, 1976 - Karel Apple,
*Paysan avec âne et seau*, 1950 - Jean René,
*Bazame Grand arbre au paysage d'hiver*, 1948 - Geer van Velde,
*Compositie*, 1948 - Pierre Soulages,
*12 Janvier*, 1952 - Mark Rothko,
*Grey, Orange on Maroon, No. 8*, 1960 - Kees van Bohemen,
*Paysage japonais*, 1962 - Woody van Amen,
*Red, White and Blue*, 1968 - Stanley Brown,
*100 km*, 1976 - On Kawara,
*30 JUL. 68*, 1968 - Jan Dibbets,
*Perspective Correction, 4 Horizontal Lines*, 1968 - Jeroen Eisinga,
*Springtime*, 2010-2011 - Raphael Hefti,
*Sensory Spaces II* - Richard Serra,
*Drawings 2015-2017* - Bruce Nauman,
*Suck Cuts*, 1972 - Joseph Beuys,
*Grond*, 1980-1981 *The Magnetic North & The idea of Freedom*- Paul Gabriel,
*Polderlandschap met Visser*, about 1880-1900 - Albert Marquet,
*Pont-Neuf au Soleil*, 1906 - Edgar Fernhout,
*Zelfportret*, 1953-1954 - Salvo,
*Senza titalo*, 1987 - Ad Dekkers,
*Houtgrafiek no. XIX* - Albert Cuyp,
*Riviergezicht*, about 1650 - Pieter Jansz. Saenredam,
*Gezicht op de Mariaplaats en de Mariakerk te Utrecht*, 1662 - Pieter Jansz. Saenredam,
*interieur van de Sint Janskerk te Utrecht*about 1650 - Constant Troyan,
*Boslandschap*, 1850 - Johannes Hendrik Weissenbruch,
*Strandgezicht met schelpenvissers*, 1981 - Anne Marie Blaupot ten Cate,
*Zelfportret*, 1930 - Carel Willink,
*Late bezoekers van Pompeï*, 1931 - Ted Noten,
*Train Necklage*, 2006 - Bertjan Pot,
*Random Light*, 1999 - Atelier van Lieshout,
*Orgono Studie-Skull*, 1996 - Yayoi Kusama,
*Infinite Mirror Room - Phallis Field (Floor show)*, 1965. (I took two picture inside: with flash light and with zoom.) - Yayoi Kusama,
*Photograph of collage (circa 1966) by Yayoi Kusama, with the artist reclining on 'Accumulation No. 2'*, after 1965. - Rembrandt van Rijn,
*Titus aan de lezenaar*, 1655 - Gunnel Wåhlstrand, Magasin III, with:
*Tore*, 2007,*Sydhälsö*, 2003,*Uppsala*, 2003,*Instön*, 2003,*Lookin at Painting*, 2008,*Mother Blue*, 2008-2009,*Institutet*, 2005,*White Peackoks*, 2007-2009,*Walk*, 2011,*Hällkaret*, 2012-2013,*Sandstranden*, 2016,*Sluttning*, 2014,*Wave*, 2015,*Lupris*, 2015,*I stugan*, 2012-2013,*Mother Profile*, 2009,*Den sista ön*, 2012,*Vinen*, 2013,*ID*, 2011,*Biblioteket*, 2010,*Nyårsdagen*, 2005,*Långedrag*, 2004, and*Vid fönstret*, 2003 - Pablo Picasso,
*Femme assise à la terrasse d'un café*, 1901
## Friday, June 23, 2017## AKI finals 2017In the afternoon, I went to theAKI finals 2016 exhibition at the
AKI. This year, the exhibition was only in the
school building. I ran into Wim T. Schippers and talked a little with him while standing at an
installation by Ole Nieling. I found the
following artist interesting:
- Yvonne Bronner. I talked with her about the two video's she took of herself, one with her walking through a field towards the camera in about 25 minutes, the other of her standing motionless for almost fifteen minutes.
- Kira Fröse. I liked her small paintings.
- Marlon Körner. He had a book (novel, I presume) in German and some pretty realistic pencil drawings of human bodies.
- Emma Bijkerk.
- Kirsten Everink. I was impressed by her work from September 29. 2016.
- Roselien Hassing with her project Het tussenmoment | The inbetween. Talked with her about the printing process that she used and colours. Very interesting to talk with her.
- Tessa Valkenburg who did something with/for theater.
- Sharony Sein with her project Cr = P x I-> Co + A->M.
- Ole Nieling. Talked with him, while he was adjusting his modular analog synthesizer that he used for his project esoterrorism.
- Annejet Brandsma. Talked with her about her project Goed Volk, which is about her home village Loo and its traditions with respect to neighbour duty.
provocatie | provocation | 挑衅
edited by Johan Visser, written in Dutch, English, and Chinese, published by
AKI ArtEZ on Saturday, July 23, 2016,
ISBN:978907552389, for € 15.00.At 18:31.
## Wednesday, June 21, 2017## Smallest maximumIn the past days, I worked on a program for calculating solutions to the Irregular Chocolate Bar problem. I discovered that it is not difficult to find solutions with using large sets of numbers where the maximum number is as small as possible. This results in the following solutions:- : 1
- : 1, 2, 3
- : 1, .., 6 except for 3
- : 1, .., 8
- : 1, .., 11 except for 6
- : 1, .., 15
- : 1, .., 29 except for 15
- : 1, .., 41 except for 21
- : 1, .., 71 except for 36
- : 1, .., 71 except for 36
- : 1, .., 235 except for 10
- : 1, .., 235 except for 10
- : 1, .., 849 except for 465
- : 1, .., 849 except for 465
- : 1, .., 849 except for 465
- : 1, .., 1201 except for 1081
Finding solutions with the smallest set (of possibly larger) numbers, proved to be much harder. The method of just generating all sets, proved to be too slow. I next worked on an algorithm that would generate sets that would fit the largest number of divisions. These sets contains twice as many or one less number of numbers. But this did not get me much further. So far, I have found: - : 1
- : 1 2 3
- : 1 2 4 5 6
- : 2 3 4 5 6 7 9
- : 2 3 4 5 7 8 9 10 12
- : 3 4 5 7 9 11 13 15 16 17 20
- : 16 17 19 21 26 27 29 31 33 34 39 41 43 44
- : 17 23 25 32 37 38 47 52 53 58 67 68 73 80 82 88
## Thursday, June 15, 2017## Irregular chocolate barYesterday, I saw a photo strip by Ype & Ionica about an irregular chocolate bar, inspired by bar from Tony's Chocolonely, that could nevertheless be equally shared by 1, 2, 3, 4, 5, and 6 persons. I noticed that in their design there were two pairs of pieces with the same surface area and I wondered if there was also a solution with all different numbers. I also wondered, if the more generic mathematical puzzle: find the 'smallest' set of natural numbers such it can be divided in all manners up to a givenn, had been addressed by someone. On
a Dutch blog by Ionica
Smeets, she reports that someone named Dic Sonneveld found a solution with
all different numbers, namely: 8,10,11,12,13,14,16, 17, 18, 19, 20, and 22.
She also mentioned that several people concluded that there is no solution with
eleven pieces. I started to do some puzzling myself and also told a colleague
about the puzzle. It is obvious that the numbers for a given n should
be equal to or be a multiple of the Least
common multiple (or LCM) of intergers upto and including n. My
colleague and I found the following solutions:
- : 1. (1 times 1).
- : 1, 2, and 3. (3 times 2)
- : 1, 2, 4, 5, and 6. (3 times 6)
- : 1, 2, 3, 4, 5, 6, 7, and 8 or 2, 3, 4, 5, 6, 7, and 9. (3 times 12)
- : 1, 2, 3, 4, 5, 7, 8, 9, 10, and 11. (1 times 60)
- : 1, 4, 5, 7, 8, 9, 11, 12, 13, 15, 16, 19. (2 times 60)
## Link- Human Self as Information Agent: Functioning in a Social Environment Based on Shared Meanings: excerpt
## Sunday, June 11, 2017## Swimming and sailingThis morning, I swam around the lake together with some other people. After having taken a shower, I went sailing with four others. We managed to return to the island with only a little use of the poles. The boats have an almost flat bottom and no keel, which makes them drift very easily, especially when there is not enough wind to make some speed. In the afternoon, I went sailing with two others. One of them jumped into the lake several times and pulled the boat while walking on the bottom of the lake. This weekend, I only played one game of Go, when Pepijn asked me to play against him. I lost with 50 against 16 points where I got nine stones ahead. But even then it is not too bad, because he is a Dan player and I also did not really concentrate a lot on the game. I did look at games being played. We also replayed the first of the 50 AlphaGo vs AlphaGo games till the start of the end game. It is a pitty that DeepMind/Google is going to decommission AlphaGo and not making it available anymore to be played against.
## Saturday, June 10, 2017## PeddlingThis morning, three others and I spend about two hours traveling through Giethoorn by boat and using poles to push the boat forward. I did some reading and also slept for an hour. In the afternoon, the couple who arrived peddling was teaching others to peddle on their boards. I also gave it a try, being a little nervous because I did not have a spare pair of trousers in case I would fall in the water. At my first attempt to stand up-right, I dropped to my knees immediately as I felt unstable. I was instructed to place my feet a little further apart. On the second try, it worked a little better. I had to take a few deep breaths to calm my hardrate and stop my legs from trembling. When I started peddling, I noticed that the trembling returned, but slowly it got a little better. When a speedboat was approaching, I dropped to my knees before the waves arrived. I guess, I would need another hour to become comfortable enough to go on a longer trip.## The Boxer and the Goal KeeperIn the evening, I finished reading the bookThe
Boxer and the Goal Keeper: Sartre Versus Camus by Andy Martin, which I started reading on May 19. I bought the book on
Wednesday, March 9, 2016. I found this a well
written and interesting to read book. The only problem I had with it, and
which I have encountered with other biographic books, is the in some places
thematic approach. The book definitely made me interested in reading more
from and about both Sartre and Camus.
## Friday, June 9, 2017## KraggehuisAt the end of the afternoon, I arrived in Giethoorn. I had wait some time before the boat arrived to bring me to the Kraggehuis, a group accomodation in the middle of the lake. When the boat arrived, I had to wait a little more, because there were some last minute shoppings to be done. The boat had no engine, so we needed to used long poles to push is forward, because the water is less than a meter deep. Some people were playing Go outside when we arrived at the island. Dinner was served around eight in the evening, just after a couple arrived peddling on 13'2 Explorer boards. I looked at several Go games being played by others.## Thursday, June 8, 2017## GOGBOT caféThis evening, I went to the GOGBOT café event at Tetem art space. There were presentations by:- Jip de Beer gave a presentation
of master thesis about
*Web Spaces*. He is the initator of MADtech.me. Earlier projects are Rapping.Reviews and Dear IMDb User. Web Spaces is built with unity. - Jos Volkers talked about his 'virtual company'
*Ecological Space Engineering*. - Insilico. Are we in a computer simulation? Glitchy locations in Enschede.
- Jeannette Petrik gave a talk on the theme of GOGBOT 2017, mostly quoting what others had said about the various subtopics.
- Jort van Welbergen talked about his projects from Rome through Skype.
- Jacco Borggreve talked about Greyman project.
## Tuesday, June 6, 2017## Link## Thursday, June 1, 2017## BookAt 17:54, I bought the bookAKI Eindexamencatalogus studiejaar 1987/1988
written in Dutch and published by Instituut voor Hoger Beeldend Kunstonderwijs
in 1988 from charity shop Het Goed for
€ 3.95.
## Link## Monday, May 29, 2017## Link## Sunday, May 28, 2017## Bookshops in UtrechtFrom the railway station, I walked through the streets Voor Clarenburg and Mariastraat to bookshop De Wijze Kater. I just paid a short visit and only looked at some singing bowls. Next I went to bookshop Steven Sterk and spend some time looking around. At last, I visited Broese Boekverkopers. There again, I only looked around.## Saturday, May 27, 2017 |
## IntroductionDiariesJuly 2017 Juni 2017 May 2017 April 2017 March 2017 2017 2016 2015 Alzheimer's Disease Trip to China 2010 -- contact -- ## FamilyFransLi-Xia Annabel Andy Honeymoon Others Pictures
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