缸

工 = 二 + 丨 : Mnemonic symbol: a steel beam, since 工 looks like the cross section of a steel beam. In front of the engine ((e)ng1), Gitta Giraffe (gu) is doing some hard work: She's stacking a capacitor (二) on a dinosaur bone (丨) on a capacitor (二). She's not very successful, but then she gets the idea to use steel beams (工) as support.

缶 = 午 + 山 : Frankenstein's Monster (f) is showing off his art skills right in the middle of the outhouse (ou3). He prepared some pottery (缶) to look at, but that's not all: when the bell tolls at noon, he takes a fork (山) and eats his pottery for lunch (午) as the central element of his art performance.