PURPOSE: the scientific toy of integrator is provided to improve understandability about concept of the integral calculus foundation about integral calculus. ;CONSTITUTION: multiple LEDs (10) are arranged in two-dimensional coordinate plane. Flash cell selectively flashes a large amount of LEDs of on-off. Flash cell includes multiple spherical balls (B groups), guide pad (20) and multiple switch (30). Multiple spherical balls of the movement of a large amount of guide pad guide parts a large amount of LEDs and correspond to a large amount of LEDs and correspond along the y-axis direction. ;The 2013 of copyright KIPO submissions
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