Brad Downey, The Beginning and the End, 2010. via Eyeteeth.

“Louisville-born, Berlin-based artist Brad Downey has apparently been interpreting the ’68 Situationists graffito “Beneath the paving stones, the beach” (“Sous les pavés, la plage!”) by unearthing German street stones to create sand castles, impromptu 3D installations, and domino-style performance interventions.”–via Eyeteeth

Brad Downey, Castles Beneath Cities, 2008

See also Street Art and Cracks in the Matrix.