This simple exercise in colour recognition and size differentiation is great for toddlers.  Colourful and easy-to-hold, the Cylinder Ladder consists of a wooden board measuring 20 cm square with twenty-five inset holes and twenty-five cylinders in five colours (red, green, yellow, blue and orange) and five different sizes from 3 cm to 7 cm tall.  A suitable companion to the Geometry Ladder.