The Contortionist is a sleek folding bike with pivots in its aluminium frame and a lockable universal joint in the front fork, enabling it to roll up to an ultra-compact size that fits within the width of its 26 inch wheels.┬áThe designer, Dominic Hargreaves decided to eschew messy chains for this bike and opted instead for an internal hydraulic system that uses oil pumped through tubes in the frame to spin the back wheel. The bike didn’t go into production, but, elements of innovation within the design are now being developed into production bikes with an undisclosed manufacturer.