A three-wheeled device for pedal-powered riding, wherein the device provides a substantial but not excessive riding challenge. The condensing unit condenses light emitted from a light source to form a condensed spot on a color wheel. Also in deployments where the endnodes require NAT, mechanisms are provided in the SBC to perform NAT on the addresses embedded in the payload of the session data. The state of the congestion point queue may be reflected by an equilibrium queue level, a queue offset, and a rate of change of a size of the congestion point queue. This device provides a solution for confining liquids to defined areas of a surface without involving physical seals and additionally permits moving the device and confined liquid on the surface.