Watch the full interview here: https://youtu.be/9S0ECCih-t8 Trevor Hawke differentiates Cusco's megalithic architecture into two styles, the clean ashlar masonry found at sites like Qorikancha and the famous polygonal style seen at Sacsayhuamán, and in both cases points to a key piece of evidence: a homogeneity of colour and texture across hundreds or thousands of blocks that hand-carved natural stone should never display.