Slope illusion 11
Outdoor tilt illusion where an ascending slope appears to descend or a descending slope appear to ascend
e.g. Magnetic Hill in Canada; Wikipedia
since April 5, 2013
A survey of the skewed staircase illusion in the Shigaraki Ceramic Cultural Park, Shiga-prefecture, Japan
April 4, 2013, reported by Akiyoshi Kitaoka and Seiichi Tsuinashi, supported by a JSPS kaken-hi grant and R-GIRO
The SCCP staircase
Copyright Akiyoshi Kitaoka 2013 (April 4) photo April 4, 2013
The steps of this staircase are horizontal, but upper steps appear to tilt down to the right when observed from below.
Akiyoshi also sees an "ascending staicase" illusion.
The steps of this staircase are horizontal, but lower steps sometimes appear to tilt down to the left when observed from below.
The steps of this staircase are horizontal, but higher steps appear to tilt down to the right when observed from below.
The steps of this staircase are horizontal, but they appear to tilt down to the left when observed from above, though photos do not necessarily show the effect.
Ceramics
Dr. Tsuinashi was measuring the dimensions.
The Shiga Ceramic Cultural Park is one hour drive from Kyoto.
Reference
Tsuinashi, S. (2005). The study of skewed staircase illusion. Japanese Journal of Psychology, 76, 139-146. https://www.jstage.jst.go.jp/article/jjpsy1926/76/2/76_2_139/_pdf
Seiichi's slope illusion pages
Slope illusion 10 (Skewed staicase of Shomaru railway station, Saitama, Japan)
Slope illusion 9 (Illusory slope in Minamitane-town, Tanegashima-island, Kagoshima, Japan)
Slope illusion 8 (Illusory slope in Nakatane-town, Tanegashima-island, Kagoshima, Japan)
Slope illusion 7 (Danjo-zaka and Okyo-zaka in Amakusa-Shimojima, Kumamoto, Japan)
Slope illusion 6 (Slope-ascending river in Miyama, Nantan, Kyoto, Japan)
Slope illusion 5 (Ghost slope in Okagaki, Onga-county, Fukuoka, Japan)
Slope illusion 4 (Slope-ascending water in Tanushimaru, Kurume, Fukuoka, Japan)
Slope illusion 3 (moving-back slope in Hashikami, Aomori, Japan)
Slope illusion 2 (Mysterious slope in Towa, Iwate, Japan)
Slope illusion 1 (Mystery zone in Yashima, Takamatsu, Kagawa, Japan, etc.)