The memory balls

So, while Joy and Sadness were struggling to find some memory balls. In a thematic world, these balls might not in the non-tag shelf. More likely, there are on some tree-nets, like a Christmas ball hung on a Christmas tree.

Or maybe a memory ball is a node-ball, which can be activated with a switch.

There are the episodic memory and the thematic memory; there might be the differences, but in some ways, they are connected. The tree-net parks need the examples/cases/situations. Examples might be temped by the schemes.