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Diary, October 2021

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Saturday, October 2, 2021

Afstemming / Balance

In the afternoon, I went to see the exhibition Afstemming / Balance with works by Peter Struycken in andriesse eyck gallery, which has eight of his new works and four earlier works (two from 2016 and two from 2014). The last series of works all have twelve colour either in a twelve by twelve grid or on a twenty by twenty grid. The colours are selected such that they are in balance with eachother with respect to brightness and saturation. The lights in the gallery where off because the works need to be viewed in daylight. Any other light source may destroy the balance. It is not even possible to take pictures (with a digital camera) of these works due to the limitations of the three colour channels of the camera. Some colour just get out of balance destroying the effect of the original works. I met with Peter Struycken and talked about him about the works, most of which took more than two months to be made, and other matters.

Afterwards, I also visited galery Ron Mandos where I saw the exhibition Lesssons of the Hour by Isaac Julien. I also visited the bookstores Boekie Woekie and Scheltema.

Wednesday, October 6, 2021

Colour correction

I wrote a script (for the MySample editor) to correct the colours in some pictures of the Afstemming (Balance) works of Peter Struycken. For each of these works he selected twelve colours with equal distance hues and the same brightness and saturation. He spend a long time to balance these at daylight conditions. When you take a picture of these works with a digital camera the balance is lost because the blueish colour become appear more bright and the redish/brown colour become darker. A side effect of the balance becoming lost is that the pattern of the twelve by twelve or twenty by twenty squares gets unintentionally the focus. The photographs of the works and the Afstemming / Balance exhibition were taken by Peter Tijhuis. The script converts the RGB to HSV, adapts the brightness depending on the hue, and converts it back to RGB. The result of the correction is not perfect and probably also depends on the colour settings of the monitor, but is hopefully a little better than the original photographs.

Thursday, October 7, 2021


At 16:30, I received the book Rusty Brown written by Chris Ware in English and published by Knopf Doubleday Publishing Group in 2019, ISBN:9780375424328, which I had bought yesterday at 14:58 in the webshop of bookshop Scheltema for € 14.95. I had seen this book last Saturday in the shop.

Sunday, October 10, 2021

Books and such

I brought some books and objects home from the former home now that she lives in a nursing home. Among them:

Friday, October 15, 2021

First compiler

This evening, I got my first 'real' compiler working. Actually, it is only the first step of a compiler. The program cc1.c can be used to compile one specific program, hex0_2.c, which can hardly be called a C program, into some intermediate file, which with some kind of macro assembler and a program to convert hexadecimal numbers to binary, resulting in a program, called hex0_2 that does that: converting hexadecimal numbers to binary. In the past weeks, I spend quite some hours debugging various versions of the hex0_2 program with the edb debugger to fix bugs in the cc1.c program.

Saturday, October 16, 2021

Rinus Roelofs: Mathematical art

I went to TkkrLab for the Cyber Saturday presentation by Rinus Roelofs about mathematical art. (It is about half a year ago that ago that I visited a space.) His presentation is about folding flat shapes into 3D objects. The oldest description is by Albrecht Dürer. Roelofs showed a number of animations based on these descriptions. He also talked about Infinite Regular Polyhedra. He experimented with all kind of constructions of basic shapes where all the shapes are connected with straight angles, which if made from wood with a laser cutter can be put nicely together.

The presentation, in Dutch, but with a lot of interesting animations, was recorded and can be found on YouTube: CyberSaturday: Mathematische kunst door Rinus Roelofs.

Thursday, October 21, 2021

Strage day

This morning, my mother passed away at the age of 91. She already received end-of-life care for some days and at her age and condition it was not very likely that she would recover from her illness. My oldest sister stayed with her during the night taking care that she was comfortable. I am happy that Annabel and I visited her last Tuesday for about half an hour. She was only briefly awake and excused herself before falling asleep again. I visited her on October 2 and had a nice talk with her.

This morning, Conny handed in the keys of her former home, where she lived for fourteen years. In the past months we spend a lot of time moving things to our come and cleaning her home. Hopefully, we will have some time for other activities, such as searching for border poles and visiting exhibitions.

Going into the city

I went to the city to get some recent passport photo for the renewal of my driver's license. At the shop I got another set of four of them and a medium sized portrait photo with me smiling for free. After this, I went to bookshop Broekhuis. There I saw the exhibition of Balance in Life with photographs by Jelle Rietveld as part of the Fotomanifestatie Enschede '21, which has the theme: Colors of Life.

At 11:35:56, I bought Moleskin daily planner for 2022 and the book Room to Dream: A Life written by David Lynch and Kristine McKenna in English and published by Canongate Books in 2018, ISBN:9781782118404, for € 17.95.

This months interesting links

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