Groping about
Chalk and bees' wax

Upon entering this state of utter darkness, your hands by your side just in front of your body, your palms facing forward in an attempt to identify obstacles; darkness is perceived as a spongy mass and the sensation you have is that of leaving footprints in the blackness.

Materials also have their significance; chalk can be seen as a non-material; a material of transference. Wax, on the other hand, makes us think of its relationship with temperature and its deformation, and draws us into the ritual.
Quico Estivill
Slide-show "Groping about"