Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 455
human eye—^that is, aspot which is insensible to light. The eye is generallyregarded as a perfect instrument, but it is not yet so byany means. One of our great philosophers remarked that 98 OPTICAL ILLUSIONS. if an instrument were sent home to him so full of errorshe would feel justified in… … An optical illusion. Then fix the gaze on the small cross in the picture, andbring the book close up. At a little distance the whiteball will disappear from the page. The illustration shows us a very curious optical ilhision,and one very easy to practise. Roll up a sheet of paper,and look through…
Scientific recreations
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