A Tressle was a style, or type, of artwork.

Moff Glovstoak was in possession of a number of such pieces, which were on public display in his palace. Although grandiose, they were relatively cheap, and within the legitimate means of Glovstoak. The display of flats, sculptures, tressles, and volmans that Glovstoak owned was a ruse meant to draw away suspicion from the private collection of art he had assembled using embezzled Imperial tax revenue.