A series of Coke bottles and bottles of imitators.  The blurb on the
left, unreadable in this image, explains how Coca-Cola fought off
imitations by eventually designing a bottle shape that could be
trademarked.  Incidentally, some of these imitators' names are cute:
Celery-Cola, Koca-Kola.  If you read the bottle fast, you might be
mislead.