How to make a torus progressively thinner/smaller (not larger) using an array modifier?

Question

I've managed to do an approximation of the opposite of what I want:

By pairing an empty to the object offset in the array modifier of a torus, and scaling the empty.

However, what I'd like to do is something like this (preferably parametrically/procedurally/non-destructively):

(However in this image, this is non-procedural/destructive):

(Cross section view):

And have multiple parameters that allow me to control:

1. Distance between toruses
2. Rate at which they get smaller

Put another way, see this image:

1. For every new torus:
2. Scale the magenta circle slightly larger
3. Scale the red circle slightly smaller

Answer 1

Array and Spin.

• Add a circle, edit it such that center is outside.
• Add an empty give it uniform scale between 0 and 1
• Add an array modifier to circle, empty as object offset, and either a relative or constant offset to space them
• Add a screw modifier to revolve the circles into torii.