"The most practical plan is to have the walls of the Vault coloured as in the last diagram.
Then the way to differentiate between the various planetary sides of the Vault is simply to cover any particular side with a large sheet of strong cellophane or other plastic. So, for the Venus side, the wall could be covered with a Green sheet of plastic. For the Jupiter side with a blue sheet of plastic. For the Mars side with red. For the Saturn side with very dark blue or indigo. For the Solar side, use yellow or gold plastic. For Mercury a yellow orange plastic. And for Luna, a lavender or light violet plastic."