Compose

the same two moves. the other order.

swap the order of two moves and watch the page land somewhere else -- except when it does not

A matrix is a move applied to the whole page; doing one after another is one combined move. Order matters -- the second acts on what the first already changed, so turn-then-stretch differs from stretch-then-turn.

Concepts: linear-algebra, geometry, symmetry, rotation.

An interactive you play with one thumb, on Wundr.