LIGHTABLE - TOO MANY DESIGNERS

The Lightable by Too Many Designers (AKA Julian Appelius and Fabien Dumas) has embedded LEDs along the entire inner perimeter, sending light through the glass tabletop at a 54 degree angle. As long as the surface remains clear of objects, the light path is invisible to the eye. As soon as a placed object interrupts the path, it becomes beautifully illuminated as the light continues to pass through.

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via core77