tree / wood / coffin / wooden / simple / numb / one of the eight categories of ancient musical instruments 八音[ba1 yin1]
木
=
八
+
十
:
Mnemonic symbol: a Christmas tree. Malte Monkey is putting up a Christmas tree (木) in the bathroom of the space station (Ø4). He's using a cross (十) as a base to put the tree on, and decorates the tree with eight-balls (八).
(Internet slang) to have a simplistic view of sth (transcription of "too young, too simple" – English words spoken by Jiang Zemin 江澤民|江泽民[Jiang1 Ze2 min2] in chastizing Hong Kong reporters in 2000)