Two researchers in the Netherlands helmed the construction of a LEGO Turing machine, a quirky manifestation of the classic computer science concept first devised by Alan Turing in 1936.

The device, built by Jereon van den Bos and Davy Landman using a single LEGO Mindstorms NXT set, is one of the most impressive — and simple — attempts we’ve seen at building a physical Turing machine.