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It's a small kit for watercolorists, you can see more about it here. :)
https://steemit.com/life/@aishwarya/design-stories-3

Thank you for answer, @aishwarya. I understand. It's a water tank. But why do need a lid?

The lid was supposed to be a way of preventing the water to seep out so that one could have all the supplies ready on the go.
But have to work that out in the next prototype.