Read Neolithic carved balls could have been basis of the imperial measurement system (HeraldScotland)

I AM pleased that Jeff Nisbet has managed to do what I have tried in vain to do for the past two years which is to get media interest into what may well be the first examples of art in Scotland ("New theory sheds light on mysterious stone balls found across Scotland", The Herald, May 4) with the suggestion that the balls are, perhaps, apprenticeship pieces for entry into the profession of stone masonry.