不材

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.

材 = 才 + 木 : In the airplane's kitchen (ai2) , the King of Chu (c) investigates a Christmas tree (木) with his secret X-ray vision talent (才). He can see that the material (材) the tree is made out of is not timber (材); instead, he sees that the tree has been 3D printed.