designboom:

anish kapoor’s black whirlpool endlessly spins at galleria continua.

take a look as this seemingly bottomless hole of black water
ceaselessly spins into the floor, dragging the viewer into its menacing
abyss…

http://www.designboom.com/art/anish-kapoor-descension-galleria-continua-san-gimignano-05-25-2015/