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These objects are monolithic sculptures made by human hands. Although some of these authors are often represented as having “discovered” these objects, the fact is that they have been known to scientists since they first came to light during agricultural activities by the United Fruit Company in 1940.
Archaeological investigation of the stone balls began shortly thereafter, with the first scholarly publication about them appearing in 1943.
More flakes were knocked off from both sides of a stone and there is evidence that the maker had a preconceived notion of the tool's final form.
Acropolis - The "high point" or citadel of an ancient Greek city, like the Acropolis in Athens.