More than 75,000 tiles were manufactured to replace original glass mosaics encased in ugly pebblecrete on the walls of Sydney’s first high-rise tower. The effect is shimmering. More than 75,000 tiles were manufactured to replace original glass mosaics encased in ugly pebblecrete on the walls of Sydney’s first high-rise tower. The effect is shimmering. Culture / Art & design Sydney Morning Herald – Latest News