What makes a cup right or left handed?
First, you must realize that (drinking) cups come in two varieties: symmetric and not symmetric. Cups that are not symmetric may have a lip to ease pouring the contents. If this kind of cup is right handed, the lip will be on the side of the cup which is away from the body, which allows for a easy neat motion. If this cup is picked up with the left hand, the lip is toward the body, which makes it awkward and messy to pour. For symmetric cups, the problem is that when the decoration is only on one side. When the right handed individual picks up a right handed cup, he is able to see and enjoy the decoration. A leftie using that cup presents the decoration to the world; he is unable to see it. Lefties would benefit with symmetric cups with designs on both sides; cups with lips would have to be made in both right and left handed varieties.
