昧
=
日
+
未
:
Mahatma Gandhi (m) wants to give the kids of an orphanage the sun (日) as a Christmas present, but he wants to keep it secret, so he asks Ai Weiwei (未) to conceal (昧) the sun for him in the Eiffel Tower's bathroom (ei4). Naturally, with the sun hidden, it gets quite dark (昧).