Wood needs to walk up four moving staircases to reach the changing room. He starts from the bottom step of the first staircase. Whenever he reaches the top step of a staircase, a new staircase forms from that top step, while the rest of the previous staircase disappears. Each new staircase has a different direction from the previous one, and each new staircase has one more step than the previous one. In the end, Wood stands on the highest step of the final staircase, ready to enter the changing room. The final staircase remains completely and does not disappear.