The Pyramid Tower from Kay Bojesen stacks a series of graduated rings into a tapering form, each ring sized to nest neatly atop the one below it. Made of painted beech finished with a smooth, splinter-free surface, the tower is built for tactile play, the rings sliding on and off a central post for repeated stacking and rebuilding. Designed in the 1950s, the toy has remained a steady favorite for early hands-on learning, its simple mechanics holding up to repeated, energetic use.