1:24 AM, Wednesday February 23rd 2022
Think of looking straight on at a half a donut. The ellipse at the centre would be a straight line because you would only see the edge. As you go from the centre to the ends of the half donut the ellipses minor axes would widen until at the very end you would have a perfect circle. OK?
Now imagine you halved that half donut to leave a quarter donut. You would go from a straight line at the middle to a circle with the ellipses only getting wider until it is a perfect circle.
So it really depends on whether the sausage inverts from turning towards you to turning away ( or vice versa ). I think this is generally what is happening.
Does this help?