Stock Photo - Falcon-headed sphinx recumbent on a pedestal with a ramp, and a feline(?) behind, possibly a gnomon for a shadow clock or instrument, Late Period–Ptolemaic Period, 664–30 B.C., From Egypt, Ivory, L. 6.9 × W. 1.6 × H. 3 cm (2 11/16 × 5/8 × 1 3/16 in.), It has been suggested that this unusual piece is a gnomon, the element that casts a shadow in an instrument for measuring time by shadows. Ivory seems an unusual choice, but part of a shadow instrument preserved from Tanis is also of ivory

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