Lot 2891, A Taishan swallow stone panel within a zitan screen, Late Ming–Qing dynasty. Estimate 800,000 — 1,000,000 HKD (92,636 - 115,795 EUR). Photo Sotheby's.

the rectangular trilobite fossil panel set within a zitan frame, one side of the panel densely figured with buff-coloured fossilised marine arthropods resembling miniature swallows with outstretched wings, the plain reverse with an uneven pitted surface, mounted on a zitan stand reticulated with a panel of wan symbols above a cusped apron - height 65.2 cm, 25 5/8  in.

Sotheby's. Literati / Curiosity II, Hong Kong, 05 Apr 2016, 10:15 AM