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Optical toy
From
: Tony Wayne <
wayne@PEN.K12.VA.US
>
Date
: Thu, 6 Jun 2002 08:54:46 -0400
I have a old mini baseball card (from cracker jack) where the pitcher
switches positions when you tilt the card at different angles.
(1)Does anyone know what these cards are called?
(2) Does anyone know how they are made/work?
-tony
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