Easily create your own customized kitty stairway using the simple Bjarnum/Jarpen shelf system from IKEA. The shelves can be cut to any length and the cut edge is concealed by the sturdy metal hardware that attaches the shelf to the wall.

This project was originally posted on Flickr by Jujuo (being demonstrated by his beautiful cats Juju and Toy) and it was also blogged at one of my favorite sites, IKEA Hacker.