Those postcard models are neat. 
Many years ago I found one that has M. C. Escher's Waterfall. When you put it together and view it at the correct angle and distance it gives the illusion like the illustration. 
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~Doug~
AC010505 EAMUS CATULI! Audere est Facere THFC 19**-20** R.I.P. it up, Tear it up, Have a Ball
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