[edoceo]

The lines (rows) in Tetris have to become complete and then disappear to make room for the new falling pieces.

In code the thing has to become stable, can't just keep packing more and more noise onto it.

[tekacs]

Absolutely this: and it needs to ideally become the kind of set of abstractions that mean that every new thing added uses less net-new surface area than it would without them.