Previous Up No next

Diary, February 2020

Sun Mon Tue Wed Thu Fri Sat
  2   3   4   5   6   7   8
  9  10  11  12  13  14  15
 16  17  18  19  20  21  22
 23  24  25  26  27  28  29

Saturday, February 1, 2020


I went to see some exhibitions in the city. First, I went to photo gallery Objektief to see the exhibition Voor Orhan / Voor Fernando. Quite intereseting, not only the photographs, but also the subject and the materials used. Next, I went to Concordia, where I saw Monument Levenslicht by Daan Roosegaarde, which is part of a larger project.

Sunday, February 2, 2020

Universal palindrome date

Today is a palindrome date when written like 02/02/2020 (MM/DD/YYYY) or 2020.02.02 (YYYY.MM.DD). The previous such date was November 2, 2011, which is 3014 days ago. It is also palindrome data when written in like 02-02-2020 (DD-MM-YYYY). The previous such date was February 21, 2012, which is 2903 days ago. This makes is a universal palindrome date of which there are only twelve. The previous such date was November 11, 1111, and the next will be December 12, 2121. Note that this is also a "digital" rotation date, which means that if the date is written on a seven-segment display it looks the same when rotated over 180° This is a subset of the palindrome date that are made up out of the digits 0, 2, 5, 6, 8, and 9. It is the first for the formats MM/DD/YYYY and YYYY.MM.DD and the second for the DD-MM-YYYY format. This is the second special date of this year.

Wednesday, February 5, 2020


I recieved the book Origami for the Connoisseur written by 笠原 邦彦 (Kunihiko Kasahara) and Toshie Takahama, written in English, translated from 折り紙超難解マニア向き作品集 in Japanese, published by Japan Publications Inc. in 1987, tenth printing from September 2007, ISBN:9784817090027, from 'Boekhandel Louis Tinner - Maurice Janssen' for € 8.00. On page 58, the book presents The HK Cube, or Trick Dice, a design attributed to Kunihiko Kasahara and 芳賀和夫 (Kazuo Haga). I also found this independently: How to fold a cube from a square sheet.

Arts N Beats

I went to the opening of the exhibition Arts N Beats with black light art by Henna Khemai and music by Kids w/K at B93 artist collective.

Thursday, February 6, 2020


I went to Rotterdam, where there is Art Rotterdam Week. At the Rotterdam Tourist Information located in the central station, I got the free Art Rotterdam Week map. I went to the exhibition TECART - Quantum Supremacy, which is organized by PLANETART, which also organizes GOGBOT. The exhibition is smalller than GOGBOT. I liked the following exhibits: I went to Doppio Expresso and had some 'White Czar' tea: "Pai Mu Tan" white tea, bergomot, mandarin, vanilla, rose petals. On the way back, I took a picture of the new depot of Museum Boijmans Van Beuningen. At the entrance of the road to TECART, I had a second look at a replica of the DeLorean time machine from Back to the Future. I walked through the city. At 15:17, I bought the book Energieen edited by Wim Beeren, Frits Keers, and Din Pieters, written in English and published by Stedelijk Museum in 1990, ISBN:905006034X, from De Slegte Rotterdam for € 20.00. I also went to bookshop Donner. I took the train home and made a stop in Utrecht, where I visited the bookshops Steven Sterk and Broese Boekverkopers. At 19:19:36, I bought the book How to f*ck a woman: leer van een vrouw wat vrouwen willen written by Ali Adler, translated from the English How to F*ck a Woman, an Insider's Guide to Love and Relationships into Dutch by Margot Reesink, published by Gottmer Uitgevers Groep in 2016, ISBN:9789401302753, for € 7.90 from the latter one.

Friday, February 7, 2020

C# generics and class extensions

I have been programming in C# for some time now, and I am beginning to appreciate the language more and more. I often use a Dictionary class for collecting information about certain items. When you found an item, you want to know if you already collected some information with the item, and if not you want to add an empty record with said item, to store the information. The Dictionary class does not have a method for doing this. Using generics, I wrote a derived class with the method. But than someone suggested, that you could also implement it as a class extension. It took me some time to figure out how to specify the constraint that the class for the 'value' of the Dictionary class has a default constructor: after the header of the method with where V : new(). The final result became:
public static class DictionaryExtensions
    public static V GetOrAdd<K, V>(this Dictionary<K, V> dict, K key) where V : new()
        if (dict.TryGetValue(key, out V value))
            return value;
        V newValue = new V();
        dict.Add(key, newValue);
        return newValue;

Tuesday, February 11, 2020

Palindrome date

Today is a palindrome date when the date is written in the format MM/DD/YY: 02/11/20. This is the third special date of this year.

A Closed and Common Orbit

This evening, I finished reading the novel A Closed and Common Orbit by Becky Chambers. The novel is placed in the same universe as The Long Way to a Small, Angry Planet but it not a real continuation of the story, because the main characters in the first novel do not return in this novel. I understand that the third novel is again about different persons. I guess that there would have been room to let some of the characters of the first novel return in this second novel. This novel, much different from the first novel, reads more than one (actually two) story than like a collection of more independent stories. The first half is a little slow.

Thursday, February 13, 2020


At 17:59, I bought the book Spirits of Internationalism 6 European Collections 1956-1986 written by Anders Kreuger, Joram Kraaijeveld, and Steven Ten Thije, written in Dutch and published by Van Abbemuseum Eindhoven in 2012, ISBN:9789490757069, from charity shop Het Goed for € 1.50.

Saturday, February 15, 2020

Picasso & Matisse

Conny and I went to the Rijksmuseum Twenthe to see the exhibition Picasso & Matisse. Beauty is a line. I found the following works worth mentioning: Next we walked through the exhibition Berlin Geisterbahn with photographs by Fons Brasser. I took some pictures on the maps of the S-Bahne which were on display. Next we saw the exhibition with works by Ben Akkerman. I liked the works: From this we walked through the exhibition with works from the collection and went to see the exhibition Onzalige bossen - Onzalige tijden with drawings by Geert Voskamp. I liked the works: Finally, we saw the exhibition Ars longa, vita brevis. Although, I walked through this exhibition many times, walking through it with Conny made me see works that I had missed the times before, because she made me pay attention to them. So, it is always worth to go see some again with some one else. We completed our stay at the museum with some sausage roll with some tea.

Sunday, February 16, 2020


The record temperature of 17.4°Celcius at Twenthe Airport (beating last years record of 14.1°Celcius) was reached at the start of the evening. These high temperatures where caused by Storm Dennis, which pulled warm air from the South. Around seven, a strong cold front passed with a lot of rain, causing the temperatures to drop about eight degrees within ten minutes.

This months interesting links

Home | January 2020