置之脑后

置 = 直 + 罒 : James II of England (zh) decided to go straight edge (直) and installs (置) his new seat (置) in the space station's bathroom (Ø4). He's going to use a fishing net (罒) as a kind of spartan, straight-edge hammock.

之 = 丶 + Z : Mnemonic symbol: Sooo sleepy... "zZz" (the character looks like a "Z"). James II of England (zh) fell asleep in front of the space station (Ø1). He sleeps on a big petal leaf (丶), making loud "zZz" (之) sounds.

脑 = 亠 + 凶 + 月 : Napoleon and the moon lost their minds in the aorta and put their brains in the middle of the room. Now they're dancing around their brains in a weird ceremony. The moon put on a vicious demon mask and Napoleon is wearing a way too large beret while they dance around their brains.

后 = ⺁ + 𠮛 : Mnemonic symbol: Zenobia, Queen of Palmyra. Zenobia (后) and Hamlet (h) want to bake banana bread in the outhouse's bathroom (ou4), but they don't know how. Behind (后) a banana tree (⺁) they study a scroll (𠮛) on which the recipe is written.