Viridian is the type of feline to make sure that her room is completely filled with signs illustrating the dangers of being in said room.... but putting them on the inside of the room so you won't see them until it's too late.
Warning! Dangerous Chemicals!
Warning! Radioactive Materials!
Warning! Compressed Air
Warning! Sudden Growth!
Warning Fragile Roof!
Basically, I like to think she hangs them up like Gaming Achievements. Oh no, what was that noise? I think she just unlocked another one!