Rachel Whiteread, English, born 1963; Untitled (Twenty-Five Spaces), 1995; resin; variable dimensions, smallest: 16 &frac12; x 11 x 11 &frac14; inches, largest: 16 &frac12; x 18 1/8 x 20 1/8 inches; Private Collection; Image courtesy the artist/ Gagosian, London/ Luhring Augustine, New York/ Galleria Lorcan O&rsquo;Neill