Not everything that the design minds at Nike create is intended for public consumption. What sort of stuff do they come up with when they're not confined by the rules of retail then?

As part of the brand's celebration of Natural Motion, it's showing off some insane prototypes created by designers that were encouraged to see how they could best recreate the sensation by using out-of-the-box thinking and materials.

The samples all use the same Nike Flyknit upper, pairing it with pine needles, hair rollers, plungers, toe separators, and more.

See their creations below and learn more about Nike's Natural Motion efforts here.