As a rug enthusiast i live and breathe patterns. Patterns are key in good design. They are also essential in high level math, physics, music, chemistry, and even our own DNA. I have often felt that when people are selecting rugs to decorate their homes they respond to certain patterns better than others almost seemingly at a soul level.
I began to ponder this as some patterns are found in very far flung cultures that have similarity with ones close by. Like the feather type patterns found in the Heriz carpets of Iran and the Navajo rugs of Native Americans. I have also seen a stick figure fish in the patterns in the art of the Aborigines of Australia that is the same woven in rugs of The Baluchi people of Iran and found in the paintings of the rain-forest Indians, the Xingu of Brazil. This even inspired me to look into the study of language as symbol, Semiotics and I do hope one day to go to Arrhaus University in Denmark to study.
On a more simple level, weavers have incorporated things of nature and things with great value as patterns in their weaving. The Buddhist rugs for Tibet or China have deep religious significance as well the forms of both Islam and Zoroaster in the Persian weaving. It is also not uncommon to see more Shamanistic forms like the deer or bird or the cross most associated with Christianity.