Since we don't have the engineering degrees to better explain this to you, we'll just have to quote the official PR:
"Experiment ZR012 by C3H5N3O9 features Wankel engine inspired hour and minute indications in an asymmetrical zirconium case with articulated and compound lugs.
At first glance the time appears to be indicated by centrally rotating triangular rotors; however, the triangles are actually Releaux polygons; they rotate eccentrically rather than centrally and track complex epitrochroid curves rather than circles. The system was inspired by the Wankel engine, which features orbital Releaux polygon rotors rather than the reciprocating pistons that power the majority of our cars and machines today."
We'll take two.