The coolest thing in the world!

I bet none of you have a Tetris light. Do you? Huh? Huh? I do. And if you stop to admire the science behind it, it’s the most nerdishly light ever. 

  
There are bulbs in each section (block) and when two blocks are put together the metal rims conduct the electricity that powers the bulbs. So you can make any shape you like and as long as the metal bits are joined they’ll light up. 
 
It was a Christmas present and every time I look at it I turn into a massive need understanding how it works. 

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