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Dutch / Nederlands

Diary, January 2016

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Friday, January 8, 2016

Winter sale

Bookshop Broekuis is having a winter sale. I looked around for about an hour. I found the book dOCUMENTA (13): Das Begleitbuch / The Guidebook with 50% off in the sale for € 4.98 instead of € 9.95. This the third of three books about the dOCUMENTA (13) exhibition, which was held in 2012. I also bought the secondhand book Dictionnaire fondamental de la langue française by Georges Gougenheim for € 5.95. The book is the edition from 1958 printed in 1967. I bought it, because I think it is a good way to improve my French, if I would like to. At 11:33:32, I bought the two books.

Saturday, January 9, 2016

Multi Solo Size Matters

In the afternoon, Conny and I visited TETEM art space, where we looked at the exhibition Multi Solo Size Matters and experienced Beacons again, like we did on December 11. I bought work 368 Structure 1 from the Size Matters exhibition, which is the second work from the left from the one from the bottom row on the back wall, picture on Tumblr. I can collect the work on February 7.

Sunday, January 10, 2016


Shortly after 11 in the morning, Conny and I arrived in Amsterdam. We went to the Rijksmuseum where we first went to Asia > Amsterdam: Luxury in the Golden Age. It also included a painting with Jan Pieterszoon Coen, who is responsible for the Massacre of the Bandanese. After this we walked along the The Night Watch and mostly looked at the crowd in front of it. We also saw Internal Objects in Three Parts by Anish Kapoor. Next we looked around rooms 3.1 and 3.2 at the top floor. I was most impressed by: At last we looked around in Room 1.18, with amongst others, these works: Next we walked to Foam Fotografiemuseum Amsterdam where we looked at the exhibitions We May Have Met Before (with pictures by Wang Ningde, Feng Yan, Zhuang Hui, RongRong & Inri, and Chi Peng) and Francesca Woodman: On Being an Angel with pictures by Francesca Woodman. At 14:31:14, I bougth the catalogue of the last exhibition, ISBN:9783863357504, for € 28.00.

From the FOAM museum we walked to the city center, taking some pictures. We saw a wooden bike from Bough Bikes. I also walked into the bookshop Scheltema just so that I would be able to write about it here.

At a quarter to four, we took the ferry from the Central Station to the NDSM Werf over the IJ, where at four we arrived at the art gallery Nieuw Dakota to attend the opening of the Start-up, AKI Fine Art Painting 2015 exhibition. We met with Carina Schüring who had three works at the exhibition.

At 16:46 we took the ferry back to the Central station, where we were just able to catch an international train to Hengelo. (The route we traveled in Amsterdam in Google Earth: KML file or in Google Maps.)

Wednesday, January 13, 2016


At 11:36, I bought the book Eindexamen 2002 AKI, ISBN:9789075522198, from charity shop Het Goed for € 2.50.

JSON Iterators

Earlier this week, I studied the JSON parser called RapidJSON, which is claimed to be the fastest JSON parser in C++. I did read How to Write the Fastest JSON Parser/Writer in the World. I got a little annoyed when I discovered that it only implements a SAX push parser, which are easy to implement but hard to use, resulting in spaghetti code. I complained about this before on Wednesday, January 15, 2003 when I wrote: "SAX sucks!". After some study, I concluded that the RapidJSON library was too complicated to be quickly rewriten into a pull parser using iterators. Today, I wrote a very simple set of four iterator classes to parse a subset of JSON, having only string values and no white spaces. I have not tried to compare the performance of this simple parser with the RapidJSON parser, but I can hardly believe to be very much slower. I at least know it is much easier to use. JSONIterator.cpp has all the code: a simple string iterator, the four JSON iterators, a recursive parsing function and some simple unit test. This JSON parser has only limited syntax checking and may show erratic behaviour on incorrect input. It is only meant for educational purposes.

Saturday, January 16, 2016

Minimal touching

Recently, I have been calculating the number of Chinese Wooden Puzzle solutions for sizes N by M, where N ranges from 1 to 15 and M is one of 4, 6, 8, or 10, with 2, 3, 4 or 5 pieces of each colour. M equal 2 with one piece of each colour is not very interesting also because the U shaped orange piece cannot be used. With the latest program I have found all the solutions for M equal 4 and 6. For M equal 8, the program is working on finding solutions for N equal 10. For M equal 10, the program is also working on finding solutions for N equal 10, but solutions for N equal 9 have been skipped, this because there tend to be less solutions for even values of N compared to the previous odd value of N. I have written a program to process the data and generate the following pages with presentations of the results including lower bounds on the number of solutions for sizes that have not yet been calculated:

I have also focused on solutions that are minimal touching, meaning that pieces of the same colour touch each other as less as possible. Currently, the most minimal touching pattern for size 10 by 15 is:

This solution has 15 extra places where two neighbouring squares have the same colour than the theoretical minimal number of places. For 15 by 4 there is a solution with only one extra and for 15 by 6 with only two extra. For 15 by 8 there are solutions known with nine extra. It would not surprise me if the minimal touching solution for 15 by 10 has about four or five extra. However, finding that minimal touching solution might be very hard. Maybe, I worked on finding minimal touching solutions before in 2008. It seems that the best solution I found then, had more than 15 extra. At least I have a (stronger) upper bound, although it seems not very restrictive.

Sunday, January 17, 2016

Thin layer of snow

This morning there was a thin layer of snow, not even fully covering the ground. In other parts of the country more snow fell. I guess we had about half to one cm of snow. Most of it melted during the day.

Monday, January 18, 2016


At 11:40, I bought the following two books from charity shop Het Goed: At 17:55:55, I bought the following book from bookshop Broekhuis:

Saturday, January 23, 2016


Today, Conny and I went to Almelo by train. From the station we walked through Wierdensestraat, De Waag, Schuttenstraat, Grotestraat into Krikkenstraat. There we found a row of small houses all with wood in front of the windows, except for one house. Looks like the houses are going the be demolished soon. Walking in the Canisushof we saw the building of the Christelijke Gereformeerde church in Hofkampstraat, which is situated in a row of connected houses. It seems as if some houses on the right and left are joined with the church. A little further in this street at number 49 at the corner with Reggestraat is the building that the water board De Regge ordered to be build in 1928. The building is designed by the architect H.F. Mertens, who designed in the style of Amsterdam School.

Just around the corner is Kunsthal Hoff 88, where there went to see the 57th exhibition which was opened two weeks ago when we were in Amsterdam. The exhibition contained 21 works by Carina Schüring, many of which we had not seen before. Again we were impressed by her works.

Next we walked through the city. We look around at Alberts art galary. We went into bookshop Hilarius Broekhuis, where, at 16:40:51, Conny bought two books from the winter sale. I was not really in the mood for buying something. I paged through the book Digitale Dementie by Manfred Spitzer, which argues that the use of computers and multi-media has a negative effect on the development of the brain, especially those of children. We walked a little further in the city center. After a simple dinner at 't Hookhoes sitting outside under heaters, we went home. (The route we traveled in Almelo in Google Earth: KML file or in Google Maps.)

Saturday, January 30, 2016


I received two books in the mail. I ordered the books yesterday. First I received art & project bulletin 144: p. struycken, an art magazine by Art & Project. It is an announcement, nothing more than a B/W printed A3 sheet folded once, for the exhibition p. struycken held from November 16, 1985 till December 7, 1985 open from Tuesday to Saturday between 1 and 5 in the afternoon. The exhibition consisted of FOT13B (T-18994/18517) drie-schermenprojectie II, a slide projection on three screens, made by Peter Struycken. It costed € 8.00 and I paid € 2.19 for shipping and handling.

Next, I received Das Buch der Bücher, Katalog 1/3 dOCUMENTA (13), editted by Katrin Sauerländer, ISBN:9783775729505. It has 815 pages and about the size of an A4 sheet. It weighs about 2,680 gram. It costed € 9.00 and I paid € 4.00 for shipping and handling. It is the first of three parts, of which I bought the third part Das Begleitbuch / The Guidebook on Friday, the 8th. Maybe I will also buy the second part: Das Logbuch / The Logbook.

This months interesting links

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