LSD

The room stops holding still. Walls breathe, colour smears behind anything that moves, and edges pull away from the things they belong to.

It puts the viewer inside somebody's perception instead of in front of it, which is why the distortion belongs to the space and never to the person standing in it.

The distortion runs continuously. Surfaces swell and contract slowly, straight lines bow, and the scale of the room changes while nothing in it actually moves.

Colour trails behind movement, so a hand leaves a smear of its own hue across several frames. Saturation runs high and the hues separate along every edge.

Keep the face stable. Warping a face reads as body horror, which is a different genre altogether, and the entry warns about exactly this.

Use it for a perception sequence, a music piece, or the moment a character loses their footing inside a scene.

Skip it where anything has to be read. Text, geography and faces all stop working underneath it.

Acid is an edge effect. Saturated rainbow fringing crawls around every outline and the geometry is left completely alone.

Ask whether the room moves. Colour separation on a stable frame is Acid. A space that bends and breathes is LSD.

The model distorts the face, because a warp instruction lands on whatever is most prominent in the frame. Say the room warps and the face stays stable.

The second failure is a clean stable frame with a colour filter over it. Ask for walls breathing and colour smearing behind movement.