Snapshots: The world in 24 hours, May 17

A visitor walks past the installations 'Little Planetary Harmony' (L) from 2006 and 'A Uniform Sample' (R) from 2004 by Swiss artist Mai-Thu Perret at the Aargauer Kunsthaus art museum in the town of Aarau west of Zurich May 17, 2011. [Photo/Agencies]