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.
lit. family members speak frankly with one another, not courteously, as if they were from two different families (idiom) / fig. people don't need to be deferential when they ask a family member for help / people from the same family should stick together (and good friends likewise)
lit. one palm alone cannot clap (proverb) / fig. it takes two persons to start a dispute / it takes two to tango / it's difficult to achieve anything without support