I think basicaly you could start with every shape
ie this rotated shape to get the starting point.
A sphere has limited amount of points so it can
limit the exact end shape too.
heres what I made from a rotated curve with
more points then a sphere
If you look at the bottom of this shape you can see that I started
from a base shape with a sharp corner point.
So this is also a possibility.... it doesnt have to start with a sphere !