Stacker Pentecost's desk and chair from the Propstore's lot 215.
The desk, prominent in "Gomen nasai, Sensei", is made of a dark wood, ornately and beautifully sculpted with etchings of twirling wisps of smoke (1) on each of the eight drawers and around the sides of the desk. The base, built with a criss-cross design of wood slats reminiscent of tatami or trigrams, has a middle block which can be moved back and forth, or removed entirely. It measures 77" x 39" x 35" (196cm x 99cm x 89cm).
The matching chair features an emblem carved on the back; two, three-toed, Japanese dragons looking up, the smaller of which holds a sword in its mouth carved into the wood. A cushion in grey, woven net upholstery (such as [x]) completes the piece.
(1): the whisps remind me of the clouds at the beginning of "Mulan", and the only picture I could find with clouds remotely similar was from [x], but I can't find the name or artist, let alone another source of it.