A description as seen on domus goes thus,
Produced with CNC machinery, SWISH is a lightweight seat made of 27 thin wooden elements. The components are interlocked through a system of individually designed junctions and hinges, each different from the other. As a result, the object can take different configurations, in a way that wouldn’t be possible with traditional techniques.
An excerpt from the Carlo Ratti website also has this to say,
Most of the CNC furniture has a rigid feel. Not the case of Swish, a birch plywood prototype of a sinuous and dynamic stool. Its assembly is simply obtained by interlocking the components, without the need for additional hardware. Swish is the winner of Back to Stool design competition, held during the 2016 Milan Design Week and organized by MioCugino workshop, whose goals are the development and diffusion of open source design.
Carlo Ratti Associati have generously made the design totally open source and ready for open making. Download the design here.