Δx
The mathematical formula describes a number. The number is always smaller than the smallest number you can ever imagine, but it will always be bigger than number 1.
The ending part of the sculptures legs is built with spring steel that connects them to the floor. The spring steel is used in the construction of prostheses and are extremely strong and flexible. The steel picks up the minimal vibrations from the visitor who uses the stairs, which causes the sculptures to slightly sway.