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Diary, June 2015

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Wednesday, June 3, 2015


At 10:57, I bought the book Najaarstentoonstelling 1999: 19e eeuw written and published by Simonis & Buunk Kunsthandel, ISBN:9080072605, from charity shop Het Goed for € 1.25.

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Saturday, June 6, 2015

IJduino animation

I created an animation for the IJduino based on the patterns used in Komputerstrukturen 2 and 2a by Peter Struycken. To the right, a reproduction of the animation using JavaScript. The pattern changes every second, except if the change would introduce four dots to come together to form a square. It looks like there are some complex rules behind the movements of the dots, but in fact every dot moves around in its own two by two square. There are 16 dots moving around in four by four such squares.

Sunday, June 14, 2015

Antwerp trip

This weekend we went to Antwerp with the company and stayed there for one night, because the company exists for 15 year. Yesterday, I visited all kinds of bookships. Today, I also walked around a little. (Here the GPS tracks and the route I walked in Google Earth or in Google Maps). The bookshops I visited are: This morning, I went back to bookshop De Markies, because after I opened the book that I bought there, I realized that it might have been part of a set of books, because it only contained images and no text. I remembered that there was another book close to it with no price tag. That was indeed correct, and I was given Gabriel Orozco. The Samurai's Tree Variants, ISBN:9783865601803.

Sunday, June 21, 2015

Steve Jobs

Today, I finished reading the Dutch translation of Steve Jobs the authorized biography of Steve Jobs written by Walter Isaacson, which I started reading on March 20, the day after which I bought it. My primary motivation to read this book was to evaluate The Bite in the Apple by Chrisann Brennan. I have come to the conclusion that that book does indeed not give a very different view of Jobs than I had thought at first. The Japanese Zen priest Kobun is but mentioned as a side note in the authorized biography, while Brennan describes him as a key figure in the life of Jobs. While reading the biography, I often felt that my achievements fall very short of those of Jobs, but on the other hand, I am also happy I do not share his character and ambitions. I am much more like Steve Wozniak.

Thursday, June 25, 2015

'Volume' of planar graph

Given the followoing four collections of points: And a given triangular planar graph (where each face is a triangle), the vertices can be mappeld on the union of these collection, such that each edge connects two points (from different collections) such that the distance between the points is equal to the root of 2. The implication is that each triangle face of the graph is mapped to equilateral triangle. It is relatively easy to calculate the volume of the resulting triangular mesh. For each triangular planar graph there is one (or more) mapping with a maximum volume. We could call this the 'volume' of a planar graph.

The proof that a mapping exists is as follows. For each triangular planar graph there exists a four colouring of the vertices with the colors A, B, C, and D. It is clear that one could assign each of the vertices with to the 'zero'-element of the collection matching the colour, where the 'zero'-element is the element with i, j, and k being zero. The edges can be labelled with α, β and γ depending on the colours of the edges they connect, such that edges between A and B and edges between C and D are labelled with α, that edges between A and C and edges between B and D are labelled with β, and that edges between A and D and edges between B and D are labelled with γ. In this case each triangle face will be labelled with α, β and γ exactly once. The Kempe chains αγ, αβ, and βγ in the dual graph partition the vertices for each type of Kempe chain. These partions can be assigned a natural number such that adjecent partitions differ exactly one. These numbers match with the three coordinates of the points. The case where the numbers are restricted to 0 and 1 is equavalent with the mapping to the zero-elements. But other mappings are possible resulting in a greater volume.

Saturday, June 27, 2015

Books and AKI finals 2015

At 11:45:33, I bought the following two books from bookshop Broekhuis: In the afternoon, Conny and I visited the 'Finals AKI 2015' exhibition. We went to TETEM art space and next to the AKI ArtEZ building. Finally, we also went to the city center to have a look at Concordia art exhibition center, where a selection of the 'best' works were on display. I found the following artists interesting:

At 15:07, I bought Reproductie / Reproduction / Reproduktion, ISBN:9789075522365, the exhibition catalogue for € 15.00.

This months interesting links

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