In Sloping Up and Down, Felicia Law and Gerry Bailey introduce children to ramps and inclined planes through the playful world of RobbO and RobbEE. As the robots explore how ramps help things move up and down, children can begin to notice how slope, effort, height, and movement are connected. The book also points to real-world uses of ramps, from stairs and escalators to ancient building projects. This title pairs well with Kodo materials that invite children to roll, slide, lift, compare, build pathways, test steepness, and revise structures through hands-on play.