Head suffers severely from diplopia, and believes throughout the sketch that there are two of everything, including Wilson and Mount Kilimanjaro, “a pretty tricky climb; most of it’s Up, till you reach the very, Very Top, and then it tends to slope away rather sharply”.
The individual suffering from diplopia perceives a double image of everything in their surroundings, including Wilson and Mount Kilimanjaro. The sketch depicts this phenomenon as a challenging climb, with most of the ascent being upward until reaching the summit, after which the terrain becomes increasingly steep.