2021年８月２日。
堀内正和*1「三本の直方体B」*2。東京都美術館*3。台東区上野公園。
*1:See eg. https://www.tobunken.go.jp/materials/bukko/28217.html https://ja.wikipedia.org/wiki/%E5%A0%80%E5%86%85%E6%AD%A3%E5%92%8C
*2:See eg. https://museumcollection.tokyo/works/10976/ https://at-art.jp/japan/tokyo/taito/ueno/%E5%A0%80%E5%86%85%E6%AD%A3%E5%92%8C-%E4%B8%89%E6%9C%AC%E3%81%AE%E7%9B%B4%E6%96%B9%E4%BD%93-b/
*3:See also https://sumita-m.hatenadiary.com/entry/20131024/1382635808 https://sumita-m.hatenadiary.com/entry/20131026/1382718482 https://sumita-m.hatenadiary.com/entry/20160517/1463511219 https://sumita-m.hatenadiary.com/entry/2021/04/01/103306 https://sumita-m.hatenadiary.com/entry/2022/03/08/091833 https://sumita-m.hatenadiary.com/entry/2023/09/23/101249 https://sumita-m.hatenadiary.com/entry/2023/12/11/095548
