假山

假 = 亻 + 叚 : Rosa Luxemburg and Joan of Arc want to go on vacation together, but they already used up all of their vacation days. That's why for the upcoming eye examination in the ashram's bathroom, they put in some glass eyes so that they will get a sick leave.

Mnemonic symbol: a fake eye, 假眼

山 = 丨 + 凵 : Mnemonic symbol: 山 looks like the tip of a fork. Sherlock Holmes (sh) is climbing a mountain (山) in front of the anthill (an1). He uses a dinosaur bone (〡) as walking stick, and to have better grip he attached a fork (山) to its tip. Unfortunately he accidentally sticks the fork into a receptacle (凵) on the ground of the mountain and gets shocked.