Images from inside the chamber at Newgrange including the tri-spiral design on orthostat C10 which is probably the most famous Irish Megalithic symbol. It is often referred to as a Celtic design, but it was carved at least 2500 years before the Celts reached Ireland. At 12 inches in diameter the tri-spiral design is quite small in size, less than one-third the size of the tri-spiral design on the entrance stone.