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In the past weeks, I wrestled a lot with finding a correct algorithm for the
generation of irregular grids of squares and
equilateral triangles. For a long time, I worked on an algorith that would
generate all possible strings of 'pieces' (the triangles and squares at the
various orientations) from a give string of pieces. But it was only after I
decided to look at the five possible slopes of the lines on the top and bottom
of the strings of pieces and generate all possible strings of slopes from a
given string of slopes, that I succeeded in implementing the working
program irst.cpp this evening. It also groups all strings of slopes into
groups that can reach each other the program finds a total of 455 groups. Many
of these groups have just one or a few elements. There are also groups that
have strings of slopes that have not been investigated (marked with the text
'FAIL'). This is because the strings of slopes are generated by searching all
strings of pieces up to and include a length of twelve that return to the
first element of the string.
Uploading bitstream to FPGA
Yesterday evening at TkkrLab, I talked
about helping out with developing the firmware for the MCH2022 Badge. I am going to look into uploading bitstreams to the FPGA
through the USB connector. The first idea is to add a menu option to the main
menu which listens to the USB connector for a bitstream to be uploaded to the
badge and which when the bitstream is received, uploads it to the FPGA. There
is already code available to upload a bitstream from an SD-card. I will also
have to develop a program for sending a bitstream from a file to the USB. I
had a look at the code of iceprog, the program to upload bitstreams to, for
example, the UPDuino. This program talks to a flash-chip. So, it is not really
applicable. This evening, I spend cloned the firmware repo and build it,
running the Install Prerequisites for ESP-IDF and next using the following commands:
git clone https://github.com/badgeteam/mch2022-firmware-esp32.git
git submodule init
git submodule update
I only found the BADGE.TEAM > ESP32: firmware development > Getting started page
after I did this. I do not know whether this is still up-to-date. I spend some
time studying the code in the 'main' folder and from there also some files in
some other folders.
De vijfde lijn
I finished reading the book De vijfde lijn
(Dutch for The fifth line) which is based on a number of talks between
Steven Aalders (a
Dutch abstract artist) and Robert van Altena (a Dutch art critic). I started
reading the book on February 23. I bought it on January 26. Just like with Peter
Struycken, colour plays a central role in his works. He makes use of
simple shapes, mostly rectangles. Compared to Struycken, it seems to me that
his approach towards colours is more intuitive (based on emotions) whereas
that of Struycken seems to be more rational. On page 36 of the book Struycken
is mentioned along with Jerry Zeniuk (a German artist) and Daniel Buren. On page 237 Aalders makes a remark how Rembrandt in his painting Self-Portrait with Two Circles made use of the four colours from the
Greek antiques: Whites, blacks, ochres and reds. Struycken has studied the use
of these four colours from the Greek antiques through history. On page 192
the book references Sentences on Conceptual Art by Sol LeWitt.
Spruce Street, Berkeley
I have started reading the book A Heartbreaking Work of Staggering Genius. I was reading Chapter 2, where
it mentioned Grotto Rock. After some map searching, it seems that they lived at
876 Spruce Street, Berkeley. The book also mentions the author walking down
Marin Street, but that must be Marin Ave. Although Cragmont Elementary School is just across the street, in the book it says
that they send Toph to Black Pine
Circle. On page 59, there is a mentioning of a nude beach. This could
either be Gray Whale Cove State Beach or a smaller one closer to Montara that is now
Addition: On Monday, I discovered that Cragmont Elementary School was closed between 1990 and
Today, Conny and I arrived in the village Pannerden where we are actually staying outside the village near the ferry
Pannerdens Kanaal to Doornenburg. The ferry is one of eleven motor supported reaction ferries in the Netherlands. There are three small boats up
stream through which the ferry is connected with a cable to the anker point in
the middle of the canal. After we arrived, we sat outside and watched the
sunset. We will stay here for about a week and make trips to surrounding areas
Tolkamer and Hochelten
In the morning, Conny and I, went to the village Tolkamer. The name is Dutch for toll room. It is on the riverbank of
The Rhine with Germany on
the other bank. For about 7.8Km the border the Netherlands and Germany is in
the middle of the Rhein. Actually, the west half is the Bijlandskanaal.
In the afternoon, we visited the village Hochelten, which is part of
Elten. It is just across the
border in Germany. Through the ages it has either belonged to the Netherlands
and Geramny. The last period it belonged to the Netherlands was between April
23, 1949 and August 1, 1963. Even now it is surrounded by the Netherlands
from three sides. There is a mixed population of Dutch and Germans living in
the village. We met with at least one German person there who spoke perfect
Dutch. Hochelten is on a hill that is about 82m above sea level. On the top of
the hill, there is the church St, Vitus. The first church was build in
967 on this spot. We visited the church. Before we came to the church, we
saw Der Stein Tor (German for The Stone Door) sculpture by Christoph Wilmsen-Wiegemann. Near the church there was
also a stone chair from which you could see some dent in far away hills that
could be seen between the 'door'. We wondered if on that far away hills there
would be a similar sculture. In the evening, we discovered that dent is near
the Klever Schlosspark. The church belonged to a Damenstift, which was also on top of the hill. We also visited the
Brususbron, a 57 deep well on the top of the hill, which was probable dug to
provide water for the damenstift. The name refers to Nero Claudius Drusus, who although he did campaigns in the area, is not
believed to have visited the hill nor commanded to dug the well.
We also visited a number of border poles in
the morning and afternoon. These are:
- At 11:08, pole 659 (N)
- At 11:39, pole 600 (N)
- At 15:01, pole 663-D
- At 15:03, pole 663-E
- At 15:15, pole 663
Conny and I woke up around a quarter to four and went
outside to see the lunar eclipse. The weather prediction stated that it would be cloudy, but
the sky looked clear. However, when the eclipse increased and the moon went
down, it became clear there were clouds at the horizon. Due to the sun getting
up at our location, the sky became too light to see the part part of the moon
and see the redening that is typical for a blood moon. Below a crop of
one of the last good pictures
Conny took from the moon. After this, we turned around our chairs to watch the
sun rise. Below one of the
pictures Conny took from the red sky before the sunrise. We also watched the
first trips of the ferry going from the otherside to our side and back. We were
surprised by the number of cars on those trips guessing that there must be a
number or regulars taking these first two trips.
This afternoon, Conny and I made a trip through
Germany. We first visted Emmerich am Rhein where we walked along the Rhein front and visited two
Roman Catholic churces. Next we travel to the Spyk hamlet on the south front
of the Rhine were at 13:35 we found the border
poles 660 (D). One of them was a little closer to the river in an area that
we could not visit. We saw some dark clouds and heard some thunder. We
continued to the remote village Schenkenschanz and waited some time in the car for the rain to stop before
we walked through the village. At the location of the village there used to
be a fortress at the location where the Rhein would split into the Waal and the
Nederrijn. Through several efforts to canal the river, that location has now
changed close to Pannerden. The last place we visited was Kleve were we only visited the Klever Schlosspark. Just across the road
there is a long pond going into the direction of the church at Hochelten. This
only becomes visible from the lookout point higher up the hill. Around the pond
there is a pathway named after the German artist Joseph Beuys.
This afternoon, Conny and I went to city of Nijmegen. We first visited the Valkhof Museum where we spend most of out time at the
Moving Stories, the riches of the Limes exhibition. It is a mixture of archaeological artifacts and modern art. I
liked the following items from the exhibition:
From another exhibition about Nijmegen, I would like to mention the following
From the exhibition Space: Moonshot part two, I would like to mention
the following works:
- Gezicht op de Nijmeegse binnenstad vanaf de spoorbrug by
Hendrik Elias Roodenburg, 1926.
- Gezicht op de benedenstad met op de achtergrond de Sint-Stevenstoren
by Dorus Arts
- Gezicht op het Valkhof vanaf de Vleeshouwerstraat by Ben Viegers.
- Gezicht op Nijmegen vanaf de Lentse Waaloever Evert Moll, 1920-1930.
(At home, I read that Berend Hendriks and Peter
Struycken initiated the Arnhem school of environmental art. I do see some
similarities in the drawings that were exhibited and the Wetmatige
bewegingen works by Peter Struycken.
- Rotation fourfold 1-4 by Kenneth Martin, 1975.
- De innerlijke strijd van de handelsreiziger by
- Thema III T 11; eerste tekening voor schilderij 04 van thema III; de
vierde cirkel by Berend Hendriks, 1970.
- Thema IV T 17; tekening nr. 17 voor thema IV; reeksmatige ontwikkeling
regel B; enkelvormige kerngroei in 3 lagen, aanzet. by
Berend Hendriks, 1976,
- Thema IV T 13; reeksmatige ontwikkeling regel B, ontwerp by
Berend Hendriks, 1973.
After the visit to the museum, we visited Antiquariaat Van Hoorn (at Houtstraat 35), a bookshop with second hand
books. We also paid a short visit to an underground bike shop where the
remains of an old defense tower are revealed. It is called the lost tower,
because there was no record of a tower at that location. The tower was part of
a second ring of stone walls and towers around the city that was believed to
have been build but for which never any evidence was found.
We had a dinner at Thibea, were we ordered the following dishes:
- Red lentil walnut craquettes. Red lentil walnut croquettes, kimchi
mayonannaise, lemon. (As a starter.)
- Caulifower 'steak'. Roasted harissa cauliflower, carrot chickpea
cream, escalivada, green asparagus, spinach, almond, wild garlic dressing.
(One for each of us.)
- Roasted sweet potato. Cashew sour cream, pimentón, spring
onion, green herbs. (As a side dish.)
Afterwards, we walked through the city to look at the remains of old medieval
and Roman walls on the river side of the town. I walked the labyrith at the river side from the inside to the center. While
standing at the center, I heard my own voice bouching of the round walls of
the labyrith. I cheated on the way out.
Conny and I visited Fort Pannerden, a disused military fort. We learned something about the
history of the area and the fort. The audio tour was quite interesting. It took
us about two hours to walk through the fort and listen to all the stories. In
the middle of the tour we saw an exhibition of
woouden sculptures by Will Schropp. We
also bought two metal mugs. Next we walked to the end of the dam where the Bijlands Kanaal splits into Pannerdens Kanaal and the river Waal.
Conny and I went to Arnhem. We first went to Museum Arnhem. From the exhibition
consume by, I found the following works interesting:
From the exhibition from left to right, I liked the following works:
- Science Fiction Postcards by Stéphanie Roland, 2013.
(This had a heating panel besides it, which I found a little strange in
an exhibition about the climate, while it was also possible to use body
- Maaier by Jan Toorop, 1915.
- De Storm by Helma Pantus, 1991.
- In Pursuit if Bling by Otobong Nkanga, 2014.
- De zich spiegelende beek by Johannes Warnardus Bilders, circa 1870.
- Heidelandschap by Frederik Hendrik Hendriks, circa 1840.
- Drie Schildpadden by Carel Willink, 1952
- De maraboes by Carel Willink, 1962.
- Bush Compulsion: a Primitive Breakthrough in the Modern Mind by
Melanie Bonajo & Emmeline de Mooij, 2008.
- IJsselgezicht bij Hattem by Jan Voerman Sr, circa 1925-1930.
- Woudsterweg bij Oranjewoud by Jan Mankes, 1912.
- Weidelandschap by Ali Goubitz, 1934.
- Primordeal Earth (foto serie) by Léonard Pongo, 2017-Now
- Zonder titel by Britta Marakatt-Labbu, 2011.
- Growth by Wiebke Pandikow, 2016.
From the exhibition open, I liked the following works:
- Andere wereld by Maurits Cornelis Escher, 1947.
- Kust bij Amalfi by Maurits Cornelis Escher, 1931.
- Mijn moeder by Wim Schuhmacher, 1925.
- Babel by Nicolaas Wijnberg, 1970.
- Zittend naakt voor de spiegel by Herman Meurs, 1929.
- Vrouwen in de straat by Pyke Koch, 1964.
- Bladeren met fruit by Edgar Fernhout, 1935.
- Witte kelkjes by Edgar Fernhout, 1935.
- Zonder titel by Gaby Bovelander, 1977.
- Zelfportret (naakt) by Henk Mual, 1959.
- Hate crime surivor I by Zanele Muholi, 2004.
- Zelfportret (gender) by Dorian Hiethaar, 1984.
- The guilt of the privileged by Marlene Dumas, 1988.
- Protester #1-24 by Iris Kensmil, 2020.
- De leesplank by Klaas Gubbels, 1964.
- Stilleven met de hand by Dick Ket, 1933.
- Stillevem met druiventros by Dick Ket, 1934.
- Zelfportret by Dick Ket, 1939.
- Stilleven met bokkingen by Raoul Hyncker, 1941.
- Damesportret by Henri van de Velde, circa 1930 - 1940.
- Nocture by Pyke Koch, 1930.
- Mercedes de Barcelona by Pyke Koch, 1930.
- Voorstudie voor de grote contorsioniste by Pyke Koch, 1956.
- Zelfportret by Carel Willink, 1941.
- Wilma met kat by Carel Willink, 1940.
- Het gele huis by Carel Willink, 1934.
- Château en Espange by Carel Willink, 1939.
- Job by Carel Willink, 1938.
- Ariadne van Bolivie by Carel Willink, 1926.
- Zelfportret by Berthe Edersheim, 1932.
- Jonge vrouw met portretjes by Harmen Meurs, 1929.
- Eenzaam by Herman Meurs, 1936.
- Twee vrouwen (Berthe en Lenu Edersheim by Charley Toorop, 1933.
- Liggend naakt by Charley Toorop, 1932.
- Portrait de ma by Gé Röling, 1932.
- Portret van mevrouw D. by Wim Schuhmacher, 1936.
From the sculpture exhibition in the park of the museum, I liked the following
- The tourist by Margriet van Breevoort, 2016.
- Vanitas (2) by Hans Op de Beeck, 2012.
- Borstentros by Maria Roosen, 2010.
- 12,5% Proog by Marc Quinn, 1993.
fontein by Thom Puckey, 1989.
- Venustrechter by Rebecca Horn, 1986.
- On invisible waves by Scheila Najand, 2001.
- I Almost Forgot by Peter Santino, 2001.
- Pelikaan by François Pompon, 1954.
- Vrouwelijke figuur by Dirk Wolbers, 1935.
- Voice of Nature - Fagus Sylvatica.Antropunicea 1900 by Thijs
Bierstekker in cooperation with scientist prof. Stefano Mancuso.
- Autoritratto by Alighiero Boetti, 1993-1994.
After the visit to the museum we walked along the Roemondsplein (square) were
the environmental artwork De Blause Golven (The Blue Waves) by
Peter Struycken can still be seen in its
original state. At the border of the square there is a large sign about the
reorganization of the square. This will also involve changing the art work by
changing the ratio between the width of the blue and white stripes.
We spend some time in the bookshop De Colofon. At 14:54, I bought the book
Theo van Doesburg: oeuvre catalogus written by Theo van Doesburg, Els Hoek, Marleen Blokhuis, Centraal Museum, and
Rijksmuseum Kröller-Müller, edited by Els Hoek, illustrations by
Theo van Doesburg, written in Dutch and published by Centraal Museum in 2000,
ISBN:9789068682557, for € 28.50.
Shortly after three, we arrived at St Eusebius' Church. We walked around the mostly empty church before we
were allowed to go up into the tower. The tower was closed due to some bad
weather conditions. (Later we discovered that damage caused by thunderstorms
in some eastern parts of the country including Enschede were we live.) We dared
to walk onto the two glass observation balconies at a height of 59 and 62
meters and took some pictures from them. There was also an audio tour about the
Market Garden and the destruction of the church.
After our visit to the church, we walked around a bit, and around five arrived
at the Indonesian restaurant Rasasari. We both had a big rames dish where you
can make a selection of ingredients to be used. Conny selected rendang beef,
tumis beans, gado gado with yellow rice. I selected ayam semoor chicken,
atjar, orah areh with fried rice. The dishes also came with a boiled egg,
tempeh, fried coconut and crispy potato. We both liked these typical Indonesian
Forward button presses to FPGA
Today, I have done some work for the firmware for the MCH2022 badge. I worked on the issue for sending button presses to the FPGA. I managed to get a working solution.
I needed to install the pyserial in order to run the Python script for uploading bitstream to the badge. I extended the script
a bit for debugging purposes. I was using the following command:
python3 fpga.py /dev/ttyACM0 buttons.bin
Into the city
This afternoon, I went into the city. I first went to have a look at
the exhibition Ergens in het midden...
with portrait and nude photographs by Ragnar Gischas. I was impressed by the pictures and found them artistic.
There was also a book with some pictures from the exhibition, but for some
reason the prints in the book looked less artistic and more nude. Reason for
me to not buy the book.
I walked through the city and went to bookshop Broekhuis where I found a large collection of autobiographic
books from Privé-domein ("private domain") series. At 15:50:49, I bought the
following two books:
- Eindexamencatalogus 2004 Academie voor de beeldende kunsten en
vormgeving Arnhem written in Dutch and published by Academie voor de
beeldende kunsten en vormgeving in 2004 for € 7.95.
- Aan nederlagen geen gebrek: Brieven en documenten 1988-1994 written
Grunberg in Dutch and published by Singel Uitgeverijen in 2016,
ISBN:9789029505802 for € 14.95.
This months interesting links
| April 2022
| June 2022