Indeed, 387 carved stone balls have been found in Scotland, dating
from the Late Neolithic to Early Bronze Age, with a wide variety of
interesting geometric patterns carved on them.
Maps by Dorothy Marshall.
Left: balls with 3 or 4 knobs.
Right: balls with 6 knobs.
Dorothy N. Marshall, Carved stone balls,
Proc. Soc. Antiq. Scotland,
108 (1976/77), 40-72.