Giant Piston Clock
Made for a company called Intrepid Designs who upcycle Aircraft parts into rather neat pieces of furniture https://intrepid-design.co.uk/ this is a single digit Nixie Clock that is made from a piston out of a radial aero engine. To give you some idea of size, the tube is a handmade Dalibor RZ568M and the piston measures 160mm in diameter! Must have come from a huge engine..
To tell the time with a single tube, it cycles through the digits in sequence so 12:35 for example it will light up 1 then a 2 then a 3 and finally a 5 before then going off for a couple of seconds, before then repeating the cycle.