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These days the airtight containers have come into general use.
There is one little thing that bothers us with the airtight containers.
When we put the lids on each of the containers after using them, we find it confusing to make a pair of each container and its lid because containers look all the same.
The corresponding colors between each container and its lid allow us to find the pair more easily.
SEOUL NATIONAL UNIVERSITY
OF SCIENCE AND TECHNOLOGY
Seoul, South Korea
SEOUL NATIONAL UNIVERSITY OF SCIENCE AND TECHNOLOGY
Daegu, South Korea
Jaemin Choi
SEOUL NATIONAL UNIVERSITY
OF SCIENCE AND TECHNOLOGY
Seoul, South Korea
Doyeon Park
