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Young Boulder artist Joseph Shaeffer has some pretty wild and extreme concepts -- like using the attractive and repellent properties of magnetic fields to make sculptures. In Continuum, at the now closed and sorely missed Andenken Annex, Shaeffer employed magnets to keep his sculptures together or apart, depending on his changing mood. The most remarkable piece in the show commemorated the World Trade Center with a pair of 1/500-scale models of the Twin Towers that hovered above the floor, held aloft in mid-air by magnets mounted high above, in the ceiling.