Difference between revisions of "Cafe wall illusion" - New World Encyclopedia
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This optical illusion makes the [[Parallel (geometry)|parallel]] straight horizontal lines appear to be bent. | This optical illusion makes the [[Parallel (geometry)|parallel]] straight horizontal lines appear to be bent. | ||
| − | To construct the illusion, alternating light and dark "bricks" are laid in staggered rows. It is essential for the illusion that each "brick" is surrounded by a layer of "mortar" (the grey in the image). This should ideally be of a colour in between the dark and light colour of the "bricks". | + | To construct the illusion, alternating light and dark "bricks" are laid in staggered rows. It is essential for the illusion that each "brick" is surrounded by a layer of "mortar" (the grey in the image). This should ideally be of a colour in between the dark and light colour of the "bricks." |
| − | + | [[Image:Port1010DigitalHarbour.jpg|thumb|Architecture inspired by the café wall illusion]] | |
== References == | == References == | ||
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Revision as of 00:00, 6 September 2007
The café wall illusion is an optical illusion, first described by Doctor Richard Gregory. He observed this curious effect in the tiles of the wall of a café at the bottom of St Michael's Hill, Bristol.
This optical illusion makes the parallel straight horizontal lines appear to be bent.
To construct the illusion, alternating light and dark "bricks" are laid in staggered rows. It is essential for the illusion that each "brick" is surrounded by a layer of "mortar" (the grey in the image). This should ideally be of a colour in between the dark and light colour of the "bricks."
ReferencesISBN links support NWE through referral fees
- Gregory RL, Heard P (1979). Border locking and the Cafe Wall illusion. Perception 8 (4): 365-80. PMID 503767.
External links
- Interactive version of the Café wall illusion (Requires Shockwave browser plugin)
- Another interactive version (Requires Java-capable browser)
- An animated "proof" that the horizontal lines are parallel and straight (This gif should open in most browsers)
Credits
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