The Motion Envelope: 30 Years After Flash, Figma Motion Still Cannot Say Why Anything Moves

Keyframes record how pixels move and nothing else. The Motion Envelope makes every animation declare its purpose, and a verifier proves the compiled keyframes stay inside the envelope that purpose earns. The keyframe is older than most people using it. Burtnyk and Wein published computer-generated key-frame animation in 1971, borrowing the concept from traditional animation studios older still. Macromedia Flash mainstreamed it for interface work in the late 1990s, and every motion tool since (After Effects,