故跡

故 = 古 + 攵 : Mnemonic symbol: This character only appears in 做, so we don't need a strong mnemonic symbol. We should be able to refer to 故 when we think of 故事 or 故意. Because it fits nicely to its components, I'll think of it as in the meaning of 故墓, an old grave.

故 = 古 + 攵 : There is an ancient cloister in the space station's bathroom, and Gitta Giraffe once heard a story from her fellow astronauts that there's an old tomb inside with lots of treasure. One day she can't hold herself back anymore and deliberately breaks the cloister open using a sledgehammer.

迹 = 亦 + 辶 : Joan of Arc (ji) is caring for the also-ran (亦) after she finished a marathon in the space station's bathroom (Ø4). The also-ran was wearing gladiator sandals (辶) but already after half of the race they were worn through, and Joan of Arc can see the footprints (迹) the also-ran left with her bare feet when she came in.