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We need rest our eyes after reading about an hour.
This design of book can warn you that you need rest per 20 pages. You can read the reading progress through the gradients, the reminder of a beautiful picture after per 20 pages and the color subsections.
Rest your eyes for a while per 20 pages when reading.
Tianjin Polytechnic University
Tianjin city, China
Touch Industrial Design Co.,Ltd
Foshan City, Guangdong Provice, China