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Dairy, November 2017

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Sunday, December 3, 2017

3D piano fractal

Through a tweet by Cliff Pickover, I was directed to website Robert Fathauer: art inspired by mathematics and nature where I found Three-Fold Development, which reminded me about the Fractal Jigsaw that I worked on last year. I thought about remaking this with a 3D printer. Then I noticed the remark that it was based on a 3D model by Henry Segerman. He has written the interesting book Visualizing Mathematics with 3D Printing. A collection of designs can be found on Thingiverse. I did not find the design for the Three-Fold Development. I spend some time figuring out the design myself, making some drawings. I also have been thinking about the different transition methods. I also got the idee to use a 3d printer to make the fractal jigsaw puzzles.

Wednesday, December 6, 2017


I biked to Enschede Airport Twente to see the arrival of PH-BFR, a Boeing 747-400M, on its last flight, Flight KLM747, in order to be taken apart here in Enschede. The plane landed at 13:05. It is the biggest plane that ever landed at the airport. I found a small map of the last part of the flight, which I guess, is about the part we could see from the airport (except some part when it was behind trees). I took fifteen pictures. Here on the right the one of the touch-down.

Thursday, December 7, 2017


At 17:31:48, I bought the book Observatoria written by Michiel Schwarz in Dutch and published by Westland/Utrecht Hypotheekbank NV Amsterdam in 1980 from charity shop Het Goed for € 0.20.

Friday, December 8, 2017


In the evening, I went by car to Hack42, a hacker space in Arnhem to attend a lecture about the Gigatron. About half way, it started to snow. First a little bit, but it quickly is became stronger and the snow stayed on the road. The traffic had to slow down at some points to below 50 Kmph. I did arrive in time. On the way home, it has stopped snowing and the snow had started to melt, but on the first part on the highway, it seems that the snow had frozen to the road, because the wheels made a lot of noise, not allowing to drive faster than 70 Kmph. At the second half it was possible to drive at a normal speed, but I found most people driving at about 80 Kmph.

The Gigatron is a processor build with 36 TTL chips, an EPROM chip and a 32Kb ram chip. The design was made to include as less as possible chips. This resulted in a 8-bit RISC processor design, which runs at 6.25Mhrz. They managed to make it produce a VGA signal with 64 colours. They also programmed an interpretter for a 16-bits language which processes the program when it is not generating the VGA signal. They showed how it could be used to play the breakout game in colour. Thus improving on the design of Steve Wozniak, with the number of chips needed and the functionality. It should be noted that at that time 32Kb ram chips where not available yet. They plan on making it into a kit with a nice case around it. I am considering to buy one.

Saturday, December 9, 2017


I left at 8:16 from Enschede, hoping to arrive at 10:30 in Amsterdam. But half way between Apeldoorn and Amersfoort the train stopped in the middle of nowhere. It was announced that the overhead line had broken ahead of us, and that the train had to return to Apeldoorn. We were adviced to go back to Deventer and travel further over Zwolle. There were some more delays and it was only at 12:52 that I arrived in Amsterdam. It was snowing, but the snow did not stay.

While on the train, I finished reading the book The Seducer's Diary by Søren Kierkegaard, which I started reading on November 18 and bought on December 14, 2013. I found the story to be completely unbelievable, including its form.

In Amsterdam I went to bookshop Scheltema, where at 14:37, I bought the following two books:

Next, I went to gallery andriessen & Eyck to see the exhibition Drawing & and more showing drawing by five artist and a work that is not a drawing. Peter Struycken was one of the artists. Besides two drawings, there was also a large wall carpter. Although this day of the exhibition there was no formal opening, but some of the artist, including Peter Struycken and some of their relatives, came to visit. I also met Antonietta Peeters and talked with her about her work.

Sunday, December 10, 2017

Snow and rain

In the afternoon it snowed. At the end of the afternoon, it started to rain. While biking around the city I encountered three instances where cars (and one city bus) had hid each other. In all cases, the damage seems minimal. I also one time encountered a car slipping. In the evening, most of the snow on the roads had disappeared.

Monday, December 11, 2017

Hail, snow and rain

Around four in the afternoon, it started to hail. The hail was quite fine, but still hurted when touching the skin. After about twenty minutes the hail changed into snow. About an hour later it changed to rain. In the west of the country there were a lot of traffic jams and problems with trains. In the middle of the country 44 cm of snow was measured at one location.

This months interesting links

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