Countablock features thick pages cut into the shape of each numeral, creating a peek-through guessing game around the number form itself. One acorn becomes . . . one oak tree! From snowmen to puddles and eggs to chicks, quantities are illustrated twice: both before and after their “transformations.” As children interact with the pages, they will familiarize themselves not only with the numbers 1–100 and associated quantities, but with each numeral’s physicality—angles, holes, and curves, both front and back.