A knobbed cylinder is a wooden educational toy used to teach children shape and pattern recognition. It consists of a cylinder with a series of indentations, or knobs, along its surface. The knobs are arranged in patterns and the children must match the knob patterns to the indentations in the cylinder. The patterns and numbers of knobs vary between different cylinders, allowing the challenge to be adjusted.
The knobbed cylinder is thought to have been invented by Friedrich Froebel, a German educator and founder of the kindergarten system. He included them in his educational materials, believing that they would help children develop their motor and cognitive skills. Today, they remain popular in classrooms and homes and are widely used to teach children basic skills such as counting, pattern recognition, and problem solving.
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