孝思不匮

孝 = ⺹ + 子 : Mnemonic symbol: a mourning veil.

Xi Shi (xi) was breeding an egg (子) in the aorta's bathroom (ao4), and she even put a crown (⺹) on it (the crown is on top of the egg: 孝), so much she loved her little prince. Unfortunately the egg died, and thus Marie Curie put on her mourning veil (孝).

思 = 心 + 田 : Socrates is feeling blue in front of the space station. He's thinking of burying his heart under a field. When he finishes, he realizes that he has created some kind of small planet, with his heart at the center.

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.