This distinctive wall clock with bold and graphic numbers has a straightforward appearance. However, it transforms in the dark, when the black background disappears, and the numbers and hands glow and look as if they're floating on the wall.
In order for the numbers to glow in the dark, the numbers must first absorb light. The light needs to be reasonable strength, either daylight or fluorescent light, for around 30 minutes to maximize the glow. As with all luminescent paint, the glow will become weaker as time passes.