Slipper, the word is recorded in English in 1478, deriving from the much older verb to slip, the notion being of footwear that is "slipped" onto the foot. These particular slippers were found abandoned on a back porch next to their new friend, the stone door stop. Unoccupied shoes seem mysterious and lonely especially when seen outside of a domestic environment where they really don't belong. What do you think? Thanks for viewing and please come back often!