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A multidirectional `perfect paraxial’ cloak using 4 lenses. For a continuous range of viewing angles, the hand remains cloaked, and the grids seen through the device match the background on the wall (about 2 m away), in color, spacing, shifts, and magnification. The edges of the optics can be seen since this is a small-angle (‘paraxial’) cloak, but this can be reduced by using large optics and for distant viewing; also the center of the device must not be blocked. // an optical cloaking configuration designed by University of Rochester professor of physics John C. Howell and Ph.D. student Joseph Choi is pictured in Bausch & Lomb Hall September 11, 2014. // photo by J. Adam Fenster / University of Rochester


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