 The stones can be found as commemorative structures throughout Wales and are the hallmark of the National Eisteddfod having visited a community.Each stone structure is arranged in a circular formation typically consisting of twelve stone pillars, sometimes from the local area and sometimes, the stones have been brought in to represent the Welsh counties, such as at Aberystwyth.A large, flat-topped stone, known as the Logan Stone, lies at the centre of the circle and serves as a platform.