Although the exact roots and origins of early Irish dancing are lost in time, there is evidence to suggest a linkage between early forms of Celtic dance and that of modern Irish dance. The Celts were sun worshippers who practiced a pagan dance within a circular formation of stones which has some commonality to the circular formation of Irish set dancing. Celts were also said to have danced clockwise in circles on happy occasions and anti-clockwise when mourning.
They often included movements which involved repeated tapping of the feet on one spot – shades of Sean Nós – and modern solo dancing as well as setting steps in Irish and Scottish group dances.