A penny for your thoughts? This is a 1909 Lincoln penny, and it’s part of the calibration target for my MAHLI instrument. The penny is a nod to a geology tradition, where an object of known scale is used as a size reference for close-up photos of rocks and soil.
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@MarsCuriosity Adventure Time was right Abraham Lincoln is on Mars
@MarsCuriosity What are the coloured rectangles above it ?