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This is made to remind children to save their --and others-- smile. It means, keeping their life in harmony with their surroundings. Not only human beings, but also the nature they're living in.
This idea is represented in 2 choices:
1. a big smiling face in the center of the plate.
2. a smiling flower while being watered (reminding children to save the nature for their future)
The main idea here is to spread happiness and smile to the whole world, because smile is the key to happiness :)