Physicists switch between square, spherical, and cylindrical cows depending on the coordinate system they are working in. However they would be squares with a u

Physicists switch between square, spherical, and cylindrical cows depending on the coordinate system they are working in. However they would be squares with a unitless volume and length of 1. There is no need for rectangular cows, because you can just redefine the basis vectors to make it square.