吴
=
口
+
天
:
Mnemonic symbol: the water buffalo from Wu.
Willy Walrus (w) enters the space station (Ø2) with a big mandarin (口) in his hands. The water buffalo (吴) sees it and begins to pant heavily, slightly in panic. Fortunately there is an angel (天) around to calm him down and let him know that it's not the sun he's fearing.
自
=
丶
+
目
:
Mnemonic symbol: a hand mirror, which someone uses to look at themselves.
The Eye of Providence (目) is looking at itself (自) in a handheld mirror (自) in the space station's bathroom (Ø4). It think it's indeed looking very good, since Zorro (z) attached a petal (丶) to its eye (目).