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Glow in the Dark Cube
Above:Version by Mark Longridge
Click a thumbnail to see its larger version and description.
Yes, it glows in the dark!

Although the idea of placing numbers on a cube is not new, getting them to glow in the dark is.
The stickers glow a typical glow-in-the-dark green colour when "charged" with bright light.
Mark says his original idea was to use six different glow in the dark colours, but was only able to find two.

It is unknown when Mr. Longridge presented his variant. In 2010 Olivér Nagy presented his version which gives an upper bound.



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