The strange glowing ball does go from dimmer to brighter a few times over the course of the brief video, but that may simply be a byproduct of how far away it is in relation to the camera.

London's giant ball pit for adults has had a makeover – all 250,000 balls now glow in the dark. It also has a ball cleaning machine, which can clean 18,000 balls per hour, to make sure the place ...