脊柱侧凸

脊 = 兆 + 月 : Joan of Arc (ji) collapsed on the ridge (脊) of the moon during her hike in the space station's living room (Ø3). A vulture (兆) is waiting nearby for Joan to die so it can rip out her spine (脊).

柱 = 主 + 木 : It is Christmas in the space station and Julian Giant Squid (zhu) set up a Christmas tree (木) in the bathroom (Ø4). Julian Giant Squid prepared a gift for the lord (主): he gives him a pillar (柱) for his mansion.

侧 = 亻 + 则 : Wu Zetian (则) and the King of Chu (c) got married in the elevator's bathroom (e4) and after the ceremony they are so drunk that they have to lean against (侧) Rosa Luxemburg (亻) to not fall down.

Tommy Turtle (tu) is installing a convex (凸) lens to the outer hull of the space station (Ø1). The lens is so convex that Tommy Turtle is unable to embrace it with his arms.