Cross-eyed view:
Parallel-eyes view:
Gray Anaglyphs with red channel gamma=1.0, 1.2, 1.5:
Color Anaglyphs with red channel gamma=1.0, 1.2, 1.5:
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Mugs collected by Glenn H. Davis ca 1890 in Heidelberg
Photo (C) Glenn Randers-Pehrson, 2006