green glass door

What can you see through a green glass door?


I can see the floor but I can't see the carpet.

This is a word game, and a mind-puzzling one. You have to understand the concept to be able to answer. After trying to answer a million time, I finally see the connection but not the logic. :p

We spent an hour before someone came out with an idea of how the game works, and baru tah slowly spread out among us. Paning kepala memikir! hehe. Bah have a try. :)

p/s: If you know how this game works, don't tell. just play along! :D