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----------------------------Original message---------------------------- It was like a fresnel lens - a light polarizing filter with a little card which had a double picture on it. I remember the exact spot in the exact luncheonette I was sitting in when my father gave me the scientific explanation of my crackerjack prize over fifty years ago - but the picture I looked at, and, alas, the word for the optical effect slips my mind!!! It's what printers have to watch out for when reproducing pictures with lots of little lines close together like what happens to the one I attached if you reduce the size. >----------------------------Original message---------------------------- > >We have a patron who wants to know what this sort of thing is called! I >haven't got a clue, but I remember them well! Can any of you help? > >Remembr cracker-jack prizes? Sometimes the prize would be a tiny >roundel that showed one image and if you move the roundel, it showed >another image. the plastic coating was ribbed so two different images >would show. What is that technique called? Thanks! Ray Anne Lockard >(regular art librarian again!!) > >__________________________________________________________________ >Mail submissions to [log in to unmask] >Administrative matters (file requests, subscription requests, etc) > to [log in to unmask] >ARLIS-L Archives and subscription maintenance: > http://lsv.uky.edu/archives/arlis-l.html >Questions may be addressed to list owner at: [log in to unmask] __________________________________________________________________ Mail submissions to [log in to unmask] Administrative matters (file requests, subscription requests, etc) to [log in to unmask] ARLIS-L Archives and subscription maintenance: http://lsv.uky.edu/archives/arlis-l.html Questions may be addressed to list owner at: [log in to unmask]