An excerpt from
On the origins of dwarfs.
"Stone detailing/Engraving: Engravers are an odd bunch, perhaps the most innately subversive group in any dwarven fortress. During times of relative calm they enjoy carving things like triangles and mushrooms, perhaps in an attempt to create some sort of weaponized boredom. However, in troubled times they delight in covering every flat surface in an endless array of disturbing images; it's not uncommon for dwarven bedrooms to be adorned with mosaics of the inhabitant’s loved ones being gored by elephants or trampled by goats. Engravers are often described by their peers as “arseholes”."