Video prompt: a person playing guitar
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: Both the fingers and the strings deform unnaturally during pressing and plucking, leading to distorted shapes. This deformation is particularly noticeable as the fingers and strings merge in a way that breaks the natural physical boundaries.