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One can look with sympathy and pity at a small child who's crying when the waves wash away their sandcastle.
Soon they learn to build with detachment, keeping the playfulness.
Then they may even find it fun to kick the sandcastle, giggling while their friends or parents are still helping to build it.
After that they might learn that that's not a nice thing to do to friends. By then hopefully they also know better than to try to help them dam up the shore with a hand-built mound made of sand.
Children can also find it fun to talk to each other through two cups linked with a string.
After a while the game becomes boring to them and they to do something else.