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Questionmark sign / book mark

Questionmark sign
Questionmark sign

This product show that
how many days you
have not read book through
changing color of question mark shape.This product can be charged by using
solar energy system
If you push the question mark-shaped, the color can be changed by heating
the mercury ink in the product.

Design

HS.university

HS.university
Gyeonggi-do, South Korea