a pair of shoes 10 have a continuous design 30 applied to the upper structures 18 of the shoes , with the left shoe 12 containing the left portion 32 of the continuous design and the right shoe 14 containing the right portion 34 . the left and right portions of the design are formed so that when the left shoe is worn on the wearer &# 39 ; s left foot and the right shoe is worn on the wearer &# 39 ; s right foot and the feet are brought together , the continuous design is formed and is displayed to the wearer , or to third parties observing the shoes , thereby enabling the wearer and / or third parties to discern if the shoes are being worn on the correct feet .