There is debate about when island residents first started making the jumpers. Undoubtedly, residents of the islands produced a local version of a Gansey jumper similar to other areas of the British Isles for several centuries. Traditional Ganseys from neighbouring regions have much of the same cabling and pattern-work seen in Aran jumpers; however these Ganseys use different construction methods and are knit from a finer wool. Some have suggested that the jumper is an ancient design that has been used on the islands for hundreds of years. Proponents of this theory often point to a picture in the Book of Kells that appears to depict an ancient "Aran jumper". Also, many megaliths around Europe depict similar patterns to those used in the knitting, which are carved into the stone, and date back several thousand years. However, it is more likely that the knitting stitches were modelled on these than that they evolved contemporaneously.