Educational threading board

[Educational threading board]

Educational threading board, in the late Qing Dynasty, is 17.5cm long and 15.5cm high
This is an educational toy made by the Shanghai Commercial Press. It has round holes on thin boards of different shapes. It is inserted on the round holes with colored lines with iron needles at both ends. It can be freely combined into a variety of geometric shapes, such as triangle, square, circle, rhombus, multilateral, etc., which can be used to improve children’s image thinking ability