舡

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.

舟 = 丹 + ⺀ : Mnemonic symbol: 舟 looks like the tower of a yellow submarine. In front of the outhouse (ou1), James II of England (zh) stands next to his yellow submarine (舟) and asks you: will you swallow the blossom (⺀) and continue your quiet life? Or will you swallow the red pill (丹) and follow him on his adventures in the submarine?