  In this study we experimentally show that a stretched rainbow spring under
gravity or extra weight may exhibit unconventional fall motion. Specially, when
the rainbow spring is released from a high place, its lower end remains
stationary until the spring wires stack together and then all the parts of the
rainbow spring falls down together. We utilize a high-speed camera to record
the fall process of one plastic and one metal rainbow spring under different
loading conditions to systematically investigate this unconventional physical
phenomenon. We use the time of the elastic wave propagating the length of the
spring to predict the duration of the lower end of the rainbow spring remaining
still. The findings from this study elucidate this physical phenomenon which
has potential for the areas requiring temporary absolute space positioning.
