Stone blocks, that is, stone blocks whose surfaces are intentionally left rough, characterize the exterior of the palazzo medici-riccardi in florence.

Explanation:

Rustication is a decorative masonry that is achieved by cutting back the edges of stones to plane surface, while the central portion of the face is either projecting markedly or rough. Rustication provides bold and rich surface for exterior masonry walls. In classical architecture it was used to giver the visible surfaces contrast in texture.