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Clockwise circles are most common, but anticlockwise ones are far from unheard-of.
en.wikipedia.org His programs called for all sorts of unheard-of effects, and he could be satisfied with nothing short of perfection.
en.wikipedia.org It is not unheard-of for the agency responsible for the construction to simply choose the proposal that asks for the least funding.
en.wikipedia.org Such marriages are almost unheard-of because vampires had traditionally viewed human beings as sheep, that is, as food rather than romantic partners.
en.wikipedia.org The album went double platinum and spawned four top-ten hits, which was unheard-of for a local hip hop artist at the time.
en.wikipedia.org