An inverse function undoes a rule: if f sends 10 turns to 6 meters of rope, f⁻¹ sends 6 meters back to 10 turns. To find it, swap x and y and solve for y, or undo each step last step first. A logarithm is the inverse of an exponential, so log₂ 16 = 4 solves 2ˣ = 16. Composing a rule with its inverse gives x both ways, and the inverse graph is the mirror of the graph across y = x. Shifting a rule up moves its inverse right by the same amount. The crew runs every rule in the Boathouse log backwards.