 In 1957 Piene developed the "Grid Picture", a type of stencilled painting made from half-tone screens with regularly arranged points in single colors (yellow, silver, white, or gold), for example "Pure Energy" (1958, New York, MOMA).Piene's work then developed in a variety of forms.The "Lichtballette" ("light ballet", 1959) was a development of the Grid Pictures; light from moving lamps was projected through grids, thus extending and stimulating the viewer's perception of space.