Video prompt: A vibrant art class where enthusiasts experiment with watercolors, brushes moving fluidly across canvases, laughter and conversation adding to the creative buzz.
Defect: Deformation (when Object is involved in an act,  anything in this process that's weird. e.g. people walk into a wall. "Walk" is an act)
Explanation: The brush deforms through the movement, as it appears and disappears into the background.