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Models built for the 'Optical Illusions' Secretary's Challenge

The Challenge:

This challenge is an idea from Chris Fry that I've had for a while.  It is a model demonstrating an optical illusion.  There are plenty of examples, from the impossible buildings of Dutch artist M.C. Escher to the dragon whose eyes follow you round (see Constructor Quarterly issue 83).


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Built for the Optical Illusions Secretary's ChallengeAmes Window

Built by Brian Leach

The Ames Window is a variation of the Ames Room invented by Adelbert Ames. The optical illusion of the bar passing through the window occurs because the window is not oscillating let-right-left as it appears to the viewer, but is in fact rotating with...
 
 
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Built for the Optical Illusions Secretary's ChallengeHermann Grid

Built by Chris Warrell

This model was built for the January 2010 Secretary's Challenge which was to build a model demonstrating an optical illusion. It uses square cut 2½" x 2½" blue flexible plates on a sheet of white card, all in a frame of gold angles. You s...
 
 
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Built for the Optical Illusions Secretary's ChallengeNewton's Disc

Built by John Gay

This model shows that white light is made up of the three primary colours, red, green and blue.
 
 
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Built for the Optical Illusions Secretary's ChallengeOptical Illusion

Built by Chris Fry

Which span, A or B, looks the longest?  While span A looks bigger, in fact span B is longer by 1"!
 
 
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Built for the Optical Illusions Secretary's ChallengeStroboscope

Built by Alan Wenbourne

For the Optical Illusions Secretary's Challenge I decided to re-create a stroboscope. Some years ago I made one to determine the rotational speed of my E20R motor, spinning a black/white segmented disc under tungsten lighting. I remember it worked but ...

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