Consisting of four 18"(45 cm) long wooden blocks each with ten inset knobbed cylinders graded in height andor diameter.In block no.1 - the cylinder increases in both height and diameter.In block no.2 - cylinder increases in diameter but remain constant in height.In block no.3 - cylinder decreases in height but increases in diameter.In block no.4 - cylinder increases in height while diameter remains constant.
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