不愧下學

不 = 丆 + 卜 : Bruno Bear (bu) is setting up a wind wheel (丆) with a voodoo staff (卜) in the space station's bathroom (Ø4). He also puts a "forbidden" sign (mnemonic symbol for 不) on it, to make clear that it may not (不) be stopped.

愧 = 忄 + 鬼 : The demon (鬼) accepted a quest to slay Karl Koala (ku) with a flail (忄), but when he sees super cute Karl with his big eyes in the Eiffel Tower's bathroom (ei4) the demon suddenly feels very ashamed (愧) that he wanted to slay such a cute animal for no reason.

愧 = 忄 + 鬼 : The demon (鬼) accepted a quest to slay Karl Koala (ku) with a flail (忄), but when he sees super cute Karl with his big eyes in the Eiffel Tower's bathroom (ei4) the demon suddenly feels very ashamed (愧) that he wanted to slay such a cute animal for no reason.

下 = 一 + 卜 : Mnemonic symbol: from the up/down logic, and a little bit the shape of the character, a ladder.

Xi Shi (xi) is on a retreat in the ashram. Using a voodoo staff (卜), she divined that next (下) week she'll have to play the flute (一) sixteen hours per day. Because she hates playing the flute, she climbs over the ashram's bathroom (a4) wall using a ladder (下) to escape.

学 = 小 + 冖 + 子 : Xu Xian wants to study scienceology and learn more about daisies. Just inside the elevator's kitchen, he put some daisies into a prize cup and covered them with a cooking top. He wants to study the growth rate of the daisies depending on the pH of the water in the prize cup.