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©Quique Garcia/EPA/MAXPPP - epaselect epa07501215 A woman visits the exhibition 'Mirrors: In and Out of Reality' in Barcelona, Spain, 12 April 2019. Maths, physics and photonics melt in this exhibition presented by Cosmocaixa in which visitors can enter a big kaleidoscope to walk through and experience with the effects and particularities of mirrors.