Illusions observed outdoors #2

since October 17, 2004 (access since May 11, 2006)

"Ganso-ji temple grid illusion"

When the fluorescent lump is turned on, the ceiling grid appears to tilt. (A) The central horizontal line appears to tilt upward at the lump. (B) Some horizontal lines that are one block apart from the lump appear to tilt upward at the lateral sides.

This illusion needs the light of the lump.

September 3, 2005
Copyright Nishiwaki Osho 2005

The Ganso-ji temple is located in Joetsu, Niigata, Japan.

Akiyoshi's comment: The illusion A may be due to the depth contrast when visual phantoms are seen in front of the grid. On the other hand, the illusion B is the Bourdon illusion. I imagine that this might be the first example of the Bourdon illusion that is shown in the real object.

"Cathédrale Notre-Dame de Paris illusion"

The upper four columns of both sides appear to go upward.

September 3, 2005

photo taken August 29, 2005

"Chidori grid illusion"

The gratings appear to be distorted though they are linear.

June 10, 2005
Copyright Shojiro Nagata 2005 (June109)

From Dr. Shojiro Nagata who studies Kolam patterns

"Hotel floor"

The floor does not appear to be flat.

June 9, 2005
Copyright Shojiro Nagata 2005 (June 9)

From Dr. Shojiro Nagata who studies Kolam patterns

"Expanding pansy"

Pansy flowers appear to expand.

May 21, 2005

at the Garden Museum, Hieizan, Kyoto, Japan

"The Rotterdam building illusion"

It looks bigger at the top but it isn't.

March 31, 2005
Copyright Stephen G. Murray 2005 (March 31, 2005)

From Steve, England

Akiyoshi's comment: The basic illusion seems to be the one shown below, where vertical bars appear to tilt. For example, the leftmost appears to tilt clockwise a little.

I think this tilt illusion belongs to the Popple illusion as shown below, where vertical columns of Gabor patches appear to tilt alternately.

Popple, A. V. and Levi, D. M. (2000) A new illusion demonstrates long-range processing. Vision Research, 40, 2545-2549.

Popple, A. V. and Sagi, D. (2000) A Fraser illusion without local cues? Vision Research, 40, 873-878.

"The London Tube illusion"

The ad boards appear to be slanted. (thanks: F. Verstraten).

November 25, 2004
Copyright Hiroshi Ashida 2004 (November 25, 2004)

From Dr. Hiroshi Ashida (Kyoto University), who now stays in London

Akiyoshi's comment: Similar tilts are observed at the tiles attached to the escalator walls in the Kokusaikaikan (Kyoto International Conference Hall) tube (subway) station.

"The turntable illusion"

Tracks appear to diverge near the turntable.

October 17, 2004

at the Umekoji park

Illusions observed outdoors (the first version)

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