to sit astride / to ride (a horse, bike etc) / classifier for saddle horses
骑
=
奇
+
马
:
The Queen of Hearts (qi) is pursuing her favourite hobby just inside the space station's entrance (Ø2): she is riding (骑) a unicorn (马) drinking a cappuccino (奇).
术
=
丶
+
木
:
In the space station's bathroom the surgeon wants to tickle Sheldon Shrimp with a petal leaf, but Sheldon thinks it's a trap and he wants to cut him open, so he hides behind a Christmas tree.