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Dick Pountain in a recent issue of PC-Pro Magazine talks of viewing a 14th-century Byzantine two-panel diptych composed of 12 scenes arrayed in a comic strip sort of sequence, with six images to a panel.  Each 3 1/2 inch square image is composed of "tiny beads-- no larger than grains of course sand-- of coloured stone, glass, copper, gold, and eggshell."  He says the linear method of construction could certainly be deemed a "digital" pixel format, and the resolution achieved is not far below that of a computer screen.  Here is an example I found that  may be from the item he describes, or a similar one.
 

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Cydonia photo: ESA

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