If you’ve graduated beyond elementary math, this wall lamp created by Mingyu Jeung will be happy to turn on for you after you solve a randomly generated equation. If math really isn’t your thing – or you run out of fingers to count on – the integrated chalkboard may be your new best friend (though I wonder how you would see what you were writing…). As far as we can tell, problems appear to be of the simple add/subtract/multiply/divide variety, but a clever prankster would throw in a random calculus problem just to keep you on your toes.