鞏固

巩 = 凡 + 工 : Mnemonic symbol: a padlock is both secure and solid.

Although it is forbidden, van Gogh (凡) created a new piece of art by securing (巩) steel beams (工) to the rocks inside of the engine ((e)ng3) using padlocks (巩). Gitta Giraffe, who is to care about engine tries to remove the piece, but it is very solid (巩).

固 = 古 + 囗 : Gitta Giraffe is building a hard and solid stronghold inside the bathroom's space station. The stronghold consists of a cloister inside a wooden box.