A set of wooden rods in different colours representing numbers, in a plastic case. They are called Cuisenaire rods. Long orange rods are on top of the set, four can be seen. Along the bottom of the frame are green, back, brown and blue rods still in their slots in the case. The image has been cropped in the app.
The concept of using rods in maths has its origins in the 1820s. Cuisenaire rods date to the 1950s, these though are probably about 20 years old.
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