Each shelf is made by putting a board across the rungs on each side of the ladder. Board lengths get smaller as you move to the top, mirroring the shape of a Christmas tree.

HOOBRO Blanket Ladder with Basket, 17.3”L x 63.4”H, Towel Rack with Hooks, Blanket Holder Rack, Decorative Ladder Shelf, Drying and Display Rack for Bathroom, Living Room, Rustic Brown BF31CJ01 ...