纤尘不染

纤 = 千 + 纟 : Marie Curie (xi) finds that there are many fine (纤) silk worms (纟) in front of the anthill (a1). She wants to preserve the delicate (纤) worms and thus puts a kilo (千) on them to press and dry them.

尘 = 土 + 小 : Charlie Chaplin (ch) enters the encampment ((e)n2) as a vicious dust storm (尘) is blowing. He breathes so much dirt (土) that he thinks the dirt got even into his heart (小).

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.

染 = 木 + 氿 : Robinson Crusoe (r) finds that there is a small mountain spring (氿) in the anthill (an3). Unfortunately it is contaminated (染) by a plastic Christmas tree (木) standing next to it. The BPA and dye from the Christmas tree leak into the water and change the creek's color (染).