Why are most pillars in buildings cylynders rather than cuboids?

Most pillars in buildings are cylindrical rather than cuboidal because cylindrical shapes distribute loads more evenly and can better withstand compression forces. The curved surface of a cylinder allows for uniform stress distribution, reducing the risk of structural failure. Additionally, cylindrical columns are more efficient in material usage, as they require less material for the same load-bearing capacity compared to cuboidal columns. This design also allows for easier construction and aesthetic appeal in architectural designs.