The nomenclature used wasn't right. Shapes are 2D or 3D shapes, while
"objects" is a word used in the kernel code and documentation, for the
various geometric and topological elements.

This follows the style that is used in the kernel in similar situation,
which I've found advantageous, if an array is already available, with
little downside if there's not.

It's not necessary, as it's just an alias for a method that is almost as
easy to access. And it's confusing, as it implies that a sweep has its
own color that's potentially separate from the swept shape.