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 familiarise 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.