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.
Join over 240,000 designers who stay up-to-date with the Core77 newsletter.
Test it out; it only takes a single click to unsubscribe