極客

极 = 及 + 木 : As Joan of Arc (ji) and Yuwen Huaji (及) pass over the north pole (及) at Christmas just inside the space station's entrance (Ø2) they decide to celebrate this moment by having a little contest. Between them there is a rather large Christmas tree (木) and they decide that whoever climbs to its top (极) first is the winner.

客 = 各 + 宀 : Karl Marx (k) is receiving a visitor in the elevator's bathroom (e4). His guest is wearing a graduation cap (宀) and a dress made of stars (各).