As the naturalistic drama turns into a Beckett-like world, designer Christopher H. Barreca’s stylized set is literally thrown aside while the lighting by Stephen Strawbridge grows harsh. So, too, does the acting twist from natural, deeply-grounded characterizations into heightened expressions of rage and loathing.

Observantly dressed by Susan Hilferty in raggedy clothes, Shepherd and Domingo flawlessly navigate the drama’s mutating dynamics under Fugard’s well-calibrated direction.

Clocking in at two hours and 30 minutes, the play could be trimmed a bit but “Blood Knot” remains an imaginative testament to a horrendous time in South African history.

“Blood Knot” continues through March 11 at the Pershing Square Signature Center, 480 W. 42nd St., New York. Call (212) 244-7529 or visit www.signaturetheatre.org.

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