cube (32,32,20);
is the same as
cube (32);
and is a cube

cube ([32,32,20]);
Is not a cube it is a rectangular cuboid.

ie. without the square brackets the second and third dimensions are ignored.

"center=true" and "center=false" can be added to most shapes and needs to be watched. It is often easier to set it false/true than to do a translate.