(Note: Breakthrough followed in less than one hour.)
Attention is the 'active ingredient' in meditation. Feedback makes it possible to sustain attention as never before. Experience it now with these dynamic discs.
Here's how it's done:
Select a disc and focus with a gentle gaze on the bull's eye.
A halo of light will appear. Direct your attention to that.
When your mind wanders, the light will vanish.
That's your (feedback) signal to re-focus on the bull's eye.
Repeat the process for a practice session that guarantees success.
Feedback lets you mind your mind!
Orange Sunset: Feedback with this disc resembles an orange sunset.
Solar Flare: Feedback with this disc resembles solar flares.
Disappering Rings: Feedback with this disc includes an illusion of disappearing rings.
Circles or Spokes: Feedback with this disc is any change you see.
Shimmering Rings: Feedback with this disc is any change you see in the rings.

Basic Focusing Disc: With this basic disc, feedback is harder to come by.
Beginners have only seconds at a time, but each second is potent!
"The best meditation requires the most efficient technique."
STRAIGHT LINE MEDITATION:
HOW TO RESTORE AWARENESS AND WHY YOU NEED TO
by Carol E. McMahon, Ph.D. with Master Deac Cataldo
(e-book available from Kindle)