Etudes from Pi in 5 Squared is based on the first 25 digits of the infinite number pi. The sequence reads from left to right, top to bottom. The grid organizes 25 units into 5 rows and 5 columns. The curved units alternate from convex to concave. Here, the value of the digit determines the depth of each individual unit. A unit representing digit 1 is 3.5” deep, pushing the curve out 2” for digit 2, then 2” for digit 3, and so on. The largest unit, representing the 9 digit, pushes out 19.5”.