I saw these pieces awhile back at MoMA's collection from Out of Time: A Contemporary View. I'm due for another visit.

Mona Hatoum. (British of Palestinian origin, born in Beirut, Lebanon, 1952). + and -. 1994-2004. Sand , steel, aluminum, and electric motor.

There's something really zen about this piece, and I had to tear myself away from it.

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Rachel Whiteread. (British, born 1963). Untitled (Paperbacks). 1997. Plaster and steel, Overall 14' 9 1/8" x 15' 9" x 20' 8 3/4" (450 x 480 x 632 cm).

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Josiah McElheny (American, b. 1966). Projects 84. Crystalline glass, colored electric lights, metal, and painted wood.