Slope illusion 21

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 September 7, 2014


The slope illusion (Magnetic hill) in Kume-jima Island, Japan

March 23 and 24, 2015, reported by Akiyoshi Kitaoka and Seiichi Tsuinashi, supported by a Ritsumeikan University grant (Kakenhi-connected type)

This slope is called "Obake zaka" (ghost slope).


The slope before the sag appears to be a descent though it is a gentle ascent (1.0%).

Copyright Akiyoshi Kitaoka 2015 (March 24) @Kume-jima Island, Okinawa, Japan



This slope appears to be an ascend though it is a gentle descent (1.0%).

This is not an ascent.



This slope may appear to be an ascent though it is a descent.



Kume-jima Island

The lower left place


Seiichi's slope illusion pages


Slope illusion 20 (Magnetic hill in Radan, Serbia)

Slope illusion 19 (Illusory slope in Naruto Skyline, Tokushima-prefecture, Japan)

Slope illusion 18 (Mystery Zone in Yashima, Takamatsu, Japan)

Slope illusion 17 (Possible slope illusion in Hokkaido, Japan)

Slope illusion 16 (Illusory slope in Biei, Hokkaido, Japan)

Slope illusion 15 (Roller Coaster Road in Kamifurano, Hokkaido, Japan)

Slope illusion 14 (Illusory slopes in Tsunan and Tokamachi, Niigata, Japan)

Slope illusion 13 (Slope-ascending water in Tsunan-twon, Niigata-prefecture, Japan)

Slope illusion 12 (Slope-ascending water in Ujitawara-town, Kyoto-prefecture, Japan)

Slope illusion 11 (Skewed staicase of the Shigaraki Ceramic Cultural Park, Shiga, Japan)

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.)


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