Well, for starters, it defines the simplest, most perfect shape, the circle. So it’s everywhere around you. Pi is the ratio of the circumference to the diameter of a circle: π = C/d.

Floor tiles at the lift lobby of a Housing and Development Board (HDB) block in Choa Chu Kang Crescent were seen "exploding" and "popping", leaving a trail of cracked and shattered flooring.