Earth shoes were an unconventional style of shoe invented in the 1970s in Scandinavia by Danish shoe designer Anna Kalsø.[1] Unlike most other shoes, the soles were thick and the heels were thin (Negative Heel Technology), so wearing them one walked heel-downward. The advertisements said that it was like walking on the beach, where one's footprints are this way.
A new firm with the same name is now in existence, and has recently introduced shoes with negative heels in a variety of styles ranging from sandals to running shoes.