A garish painting of a matador from Morn's quarters, the only visible part of the estate Quark inherits in Who Mourns for Morn?, which conceals the key to a fortune in latinum.
The painting appears in the sixth-season Deep Space Nine episode Who Mourns for Morn?, set in 2374. When the barfly Morn is reported killed in an ion storm, his will leaves everything to Quark, who is dismayed to learn that everything amounts to debts, a mud bath and a painting of a bullfighter.
Morn's former partners in the Lissepian Mother's Day Heist soon arrive looking for a thousand bricks of gold-pressed latinum. One of them breaks the picture over Quark's head, and behind the canvas Quark finds a claim slip for a storage locker at the station's assay office, the first link in a trail that leads to the Bank of Bolias.
The bricks turn out to be worthless gold with the latinum extracted. Morn, alive after all, had kept the liquid latinum in his second stomach.