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Change the core / Life Assistant

Change the core
Change the core

In today's tense life, people may neglect some small things. For example, when going to the toilet, few people check how much toilet paper is left in the toilet carton. People can not find that how much paper at a glance, because toilet paper is always white and toilet paper box is always opaque.
Change the core, which changes color with amount. The less toilet paper is left, the closer the color of the toilet paper is to the color of the log, so that people can see how much toilet paper is left at a glance.

University

Zhengzhou University of Light Indus

Zhengzhou University of Light Indus
Henan,Zhengzhou, China

王子健 Bruce wang,
Zhengzhou University of Light Indus