19th C. art WTF.

[jbsegal]

At
https://www.evernote.com/shard/s1/sh/9de6ac9f-2959-4654-9608-9df279e2be19/933e659fdbbbdd3b239446c89a5b6ab4
there's a large picture of a section of a painting from 1870 that hangs in the Hamburg Kunsthalle. SFW.

Has anyone else ever seen such a way of holding a twinned fipple flute??