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Advent of Code
I have decided to use literature programming for this years Advent of Code and not to compete with others. See this GitHub repository for my progress. I already made some improvements
to MarkDownC. I
also started developing a language for Advent of Code puzzles. I have no idea how that is going to
I have been thinking about subsitution patterns for irregular grids of squares and equilateral triangles. If a pattern
contains a dodecagon than it is possible to replace it, as shown in this animation. So far, I have not be able come up with other finite
patterns not based on a dodecagons. So, I got this idea to see if I could find
any in the regular patterns. Below, I made a tool to search for those by
showing two patterns on top of each other in the colour red and blue. This
gave some interesting results, which can be viewed below. The best chance for
interesting combinations are when the numbers shown below the pattern match
(or are multiple of each other).
I decided to create a visualization where all combinations of two repeating
irregular grids of squares and equilateral
triangle patterns that I have generated, where it is also possible to shift
the patterns. I also made use of the possiblility of using tranparency to show
the overlapping parts as grey. Some combinations result in patterns that do not
At 15:10:51, I bought the book Historical Atlas Of Rotterdam: The City's
Growth Illustrated written by Paul Van De Laar and Mies van Jaarsveld,
edited by Lucy Klaassen, translated by Gregory Ball from Historische Atlas
van Rotterdam: de groei van de stad in beeld from Dutch into English,
published by Sun Uitgeverij on Friday, December 7, 2007
ISBN:9789085061984, from bookshop Broekhuis
for € 14.95.
Last night, I realized that a more elementary triangle lies at the base of the
dodecagon pattern that can be filled in two
ways with squares and equilateral triangles.
This is elementary triangle is an isosceles triangle with base length of 1 and
a height of 1+(√3)/2, which can either be filled with a equilateral
triangle on top of a square or a straight line of length 1 on top of a
triangle. The dodecagon can be filled with twelve of these elementary
triangles. Below some shapes that can be made with these, starting with
Enschede Lights Up
Conny and I went into the city to have a dinner at an
Indonesian restaurant. After this we walked to Tourist Info Enschede for a
guide for the Enschede Lights Up event. We also were given two glow sticks. We saw the following light works:
We also visited bookshop Broekhuis about
half way to warm up a bit, because the temperature was about -3° Celsius.
This afternoon, I reprogrammed the the LED strip for Ugly Christmas Sweater Day tomorrow with the ChristmasLEDS.ino program, which shows red and green colours
with some white flashes.
- De Stad in Beeld.
- Multiplayer Pinball Experience by 100%FAT.
- De Witte Wie? about the Witte Wieven made by Maarten de Groot, Lloyd Philippo, Andrew
Kauffman and Emar Reinita.
- Hexa Sequenser by planetart.
- Fishy McFish.
In the morning, there was about 2cm of snow. It has
been rather cold the last days, so it is not surprising that it is not wet
snow. The snow stayed during the day, because the temperature, according to
the weather station at Twenthe Airport, did not get above 0° Celcius.
Advent of Code
Todays puzzle of Advent of Code was
relatively easy compare to those of the last two days, which both took me some
considerable amount of time. This year, I did not attempt to solve the puzzles
as fast as possible. Several times, I have come up with good ideas while
being away from the screen, like yesterday evening, when I came up with the
solution for the second part of the puzzle while bring Andy back to his place,
about a half hour drive in one way direction. Today, I also made some small
improvements to MarkDownC and I discovered that using '&&' on the command line
causes the following program only to be executed when the previous did not
return an error. Now I am using the following command line to process a
single MarkDown file for a day:
MarkDownC Day18.md >p.c; gcc -Wall -g p.c -o p && ./p
This will run the MarkDownC on the input file Day18.md into the file
p.c. If MarkDownC found a parsing error, that error will be
written in a unterminated comment. The C compiler will report this and show
the line telling where the error is. When the C compiler finds errors in the
program it will return with an error status. And finally, when there is no
error, the program will be executed.
Sol_HSA has some interesting
animations for the puzzles.
The snow that fell Friday morning, has not melted away yet. This night the
temperature at Twenthe Airport dropped to -9.4° Celcius. The coldest
temperature on record for this day is -11.9° Celcius.
This afternoon, I went through some combinations of
regular grids of squares and equilateral
triangle and I found two interesting patterns which connect four
elementary triangles without containing those themselves.
They are shown below. The elementary triangles are marked with yellow. Some
black triangles are shown to display the fixed border. Also the top and bottom
(center) points are fixed.
I am also thinking about a program which systematically searches combination of
regular patters for additional patterns.
Theo van Doesburg
I paged through the book Theo van Doesburg: oeuvre catalogus about
the works of Theo van
Doesburg. I noticed that a number of his pattern resembled Street Tile Patterns in the sense that they do not contain point where
four tiles touch but only T-like crossings. The patterns I found are:
I searched if the manifestos mentioned in the book 100 Artists'
Manifestos to which he contributed could also be found amongh his
writing mentioned in the book, but did not find them.
- Compositie XVII in drie kleuren, 1920, #648.
- Compositie XVII (Herfstrood), 1918/1919, #624.
- Compositie XXII, june/july 1922, #678.
- Composition décentralisée, 1924, #713.
- Compositie, 1924, #714.
- Compositie, 1923-1924, #715.
- Kleurontwerp, 1924, #716f. (This is a colour design for a large
window consisting of smaller windows. Each of the windows follows the
pattern, but also the recangler groups of smaller windows that have the
same colour, follow the pattern.)
- Kleurontwerp voor het plafond, 1927, #803llj.
Advance of Code
I woke up early this morning and shortly after six in the morning, I went
downstairs to get my laptop. The Advent of Code puzzle was not so complicated for someone who has had an
interest in parsing for a long time. I finished it in a little more than half
an hour and then spend some time writing some notes about how I arrived at
solution. I was the 1407th person to finish this years Advent of
Shots of Dune 2021
For my page on Dune 2021 film, I was searching for a list of all shots.
I found two images with all the shots: 1938 shots of Dune 2021 enjoy! 8K edition and DUNE - all 2331 individual shots. I discovered it is not easy to display
just a part of an image using HTML and CSS. It is relatively easy with
can be compared. You have to provide the URLs for the images, preferable
after you have downloaded them, because they are rather large. Pressing the
bottom 'next' button causes both shots incremented and the numbers added to
the output field. I discovered that they do not really match. So, the actual
number of shots might be higher than 2331.
This morning, Conny and I visited Rijksmuseum Twenthe. We went there to see The Standard Bearer by Rembrandt, which our government bought for €175 million from the
Rothschild family earlier this year and that has been on tour through museums
in the Netherlands. This month it was on display here in Enschede.
In the room where The Standart Bearer was on display, there were a number of
works by Nour-Eddine Jarram on
display, which were inspirted by the painting. (See also Rembrandt meets Nour.) The ones I found notable:
- First Acquaintance, 2022
- Explorations, 2022
- The Young Standard Bearer, 2022
- The Woman Standard Bearer, 2022
- The Young Standard Bearer, 2022
- First Acquaintance, 2022
We walked through the museum and seeing the same
exhibitions as when we visited the musuem in November. I found the following works notable:
- Composition, no date, Theo Wolvencamp.
- Composition, 1966, Theo Wolvencamp.
- Composition, 1965, Theo Wolvencamp.
- Untitled, 1959, Theo Wolvencamp.
- Composition, ca. 1966, Theo Wolvencamp.
- Pagan Fables, 1954, Theo Wolvencamp.
- The Race, 1925-1927, Gerardo Dottori.
- Car + Race + City, 1917, Roberto Marcello Baldessan.
- Manifesto 'The Theatre of Surprice', 1922.
- Spiralata, 1931, Tato.
- The first flight of the Roman Aeroclub VIII, 1930.
- Gunshot on a Sunday, 1918, Giacomo Balla.
- Manifesto Parole in libertà, 1913, Filippo Tommaso Marinetti.
- Iridescent Interpretations, 1913, Giacomo Balla.
- Unique Forms of Continuity in Space, 1913, Umberto Bocciani.
- Portrait of a woman, 1911, Umberto Bocciani.
- Virginit, 1925, Giacomo Balla.
- First Futurist Manifesto in Le Figaro, 1909, Filippo Tommaso Marinetti.
- Minimal Music Piece, 1988, Peter Vogel. (I took a number of close-up pictures.)
- De Smaragdbeek, 2013, Antje Veldstra.
- Vlot, without date, Wendelien Schönfeld.
- Untitled, 2002, Jan Cremer.
- Bosrand in Canada, 1908, Richard Frise.
- Opkomst bui bij Heeze, 1909, Jan Sluijters.
- Untitled, 2006, Arno Kramer.
- Untitled, 2012, Jan van der Pol.
- 137.5, 2000, Johan van Oord.
- 31 is zelfs minder dan 33, 1987-1988, Frank van Hemert.
- Sketches for The Waterworks of Money, Carlijn Kingma.
- The Champagne Tower of Wealth Inequality.
- The Waterworks of Money, 2022, Carlijn Kingma.
- Falaises près de Pourville, 1882, Claud Monet.
- Autumnal view of Louveciennes, 1872, Alfred Sisley.
Just like last year, we will end the year
with another weather record. The temperature at
Twenthe Airport has gone up to 16.2° Celsius, which breaks the last years
record of 13.8° and is also a bit higher than the predicted maximum
temperature of 15.9°. Last night the temperature did not drop below
11.1°, which is not really a record, because last year the temperature did
not drop below 13.0° during the night, but nevertheless this is still above
the average highest temperature for this time of the year.
This months interesting links
| November 2022
| January 2023
| Random memories