have been grown via surface-initiated atom-transfer radical polymerization from micropatterned substrates. Atomic force microscopy both in topography and adhesion force mode shows that the brush domains undergo reversible phase changes in water around the polymer’s lower critical solution temperature. These switchable patterned surfaces may form a new class of microdevices. (W. T. S. Huck, C. Alexander, et al., August 16, Adv. Mater. 2002, 14, 1130-1134)