Inspired by Montessori materials but dejected by their price, I decided to try and make something myself. I made a knob puzzle with six circles of graded diameters. I used the saw blades I had and consequently I wasn't able to use diameters with an equal difference, which means that this material isn't as mathematical as I would have liked it to be, but it still appeals to toddlers.
I think it looks wonderful!!
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