Video prompt: A nighttime astronomy event where telescopes are pointed skyward, enthusiasts lining up to view celestial wonders, as constellations trace patterns in the universe above.
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 silhouettes of people under the starry sky merge together and undergo shape deformations, creating an unrealistic effect as they should remain distinct and stable.