Siebel Center Art Project. Detail view of two fake sprinkler caps. Plexiglas, mixed media. Circles each 3.25"d. and 8"d. White Plexiglas disks were made to mimic existing sprinkler caps and speakers in the ceiling of the Siebel Center. The disks were installed in the basement and second through fourth floors where the layout of the circles was not planned into a recognizable pattern. Groupings and symmetry were used to make formal relationships, improving the aesthetics of the ceiling.