108 toy ambulances chase each other forever on a steel roadway that is also a Möbius strip. The steel measures 3/8” x 2 1/2”, and was formed entirely by hand, without heat, using the specially-constructed heavy steel benders shown here. It took a number of months to fabricate it, but a number of years to collect enough ambulances.
It measures about 84” x 66” x 20” overall.