10,000 Days is the fourth studio album by American rock band Tool. The album was released by Tool Disectional and Volcano Entertainment on April 28, 2006 in parts of Europe, April 29, 2006, in Australia, May 1, 2006 in the United Kingdom, and on May 2, 2006 in North America. Recording took place at O'Henry Studios in Burbank, California, The Loft, and Grandmaster Studios (both in Hollywood, California).
The compact disc packaging for 10,000 Days consists of a thick cardboard-bound booklet partly covered by a flap holding a pair of stereoscopic eyeglasses, which can be used to view a series of images inside. Viewed with the glasses, the artwork produces an illusion of depth and three-dimensionality. Alex Grey, who created a majority of the album art for Lateralus and its accompanying video "Parabola", reprised his role for 10,000 Days.