AN OPTICAL ILLUSION
The Bird in the Cage
Draw an empty cage on a sheet of paper, and a quarter of an inch distant draw a small bird. Place a card between the two figures, holding it at right angles tq
the paper. Bring the face close up to the card, so that one eye can see only the cage and the other eye the bird. Look at the cage steadily for a few seconds, and the bird will be seen apparently to move gradually within the cage, until it occupies the place indicated by the image in the smaller drawing. This is a very good optical illusion, and may be done with the small figure in the right-hand corner of the sketch. Place the card along the dotted line, and the il" lusion will still be produced. '
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Bibliographic details
Southland Times, Issue 23444, 26 February 1938, Page 7 (Supplement)
Word Count
138AN OPTICAL ILLUSION Southland Times, Issue 23444, 26 February 1938, Page 7 (Supplement)
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