Of course there are many many other uses to feet but eventually none of them actually spring. That one and only fact is the one that proves all others wrong. The progress of those spring shoe, evolving the gravity forces and the mighty Thor mixing all kinds of elements into simple and elegant High Jumping Instruments of pure divine is a, as no other words are in my brain can describe, gift !! A gift of nature and her boyfriend, God, to us humble creatures of unSpringed legs to evolve and expand into higher levels and stupider unsafer walking movements and not to mention the dance.