The central design is a very ancient one called a "Triskelion" - a three-armed spiral. During the Middle Ages a variation on this pattern was adopted as the symbol of the Isle of Man, which lies between Britain and Ireland in the middle of the Irish Sea. The island was of tremendous strategic importance in those days, and it was one of the earliest republics in all of Europe. These days it mainly seems to be a nice place to take a vacation.
Surrounding the triskelion are a variety of spiral patterns, fretwork, gripping beasts, and knotwork borders in an overall design that recalls a piece of jewelry.
You can enter your own address and message on these postcards, or delete the text in those blocks to make it blank.