Dressage in the Fourth Dimension
Dressage is often seen as the most formal and controlled of the equine sports, following an ancient, standardized training progression. For philosopher and dressage instructor Sherry L. Ackerman, dressage--along with riding in general--is a transformational art. The second, revised edition of Dressage in the Fourth Dimension, (ISBN 978-1577316237) (Novato, CA: New World Library, 2008), is a new release of an earlier version of Ackerman's book that introduced the idea of considering dressage from this type of philosophical (especially the perennial philosophy), rather than merely physical, perspective. Drawing on such diverse sources as sacred geometry, ancient Western and Eastern philosophies, and esoteric spirituality, Ackerman attempts to heal humanity's alienation from nature through riding.  This is a Second Edition, with a Foreword by Linda Kohanov (author, Tao of Equus, Riding Between the Worlds) and illustrations by Jane Pincus (co-author, Our Bodies, Ourselves). Dr. Ackerman is an international dressage clinician  and is one of the American equine industry’s foremost proponents of eco-spirituality and nature mysticism.  
- ↑ Riding Hurts, by Dr. Thomas Ritter, 1999; http://www.classicaldressage.com/articles/hurts.html
- ↑ Piaffe Flyer, Issue January '07, by Lucy Maynard. http://www.enydcta.doityourselfsitebuilder.com/f/SherryProfile.pdf
- ↑ Yoga for Equestrians: A New Path for Achieving Union with your Horse, by Linda Benedict and Veronica Wirth, Trafalgar Square Books, 2000.
- ↑ Philosophy in Practice: Dressage in the Fourth Dimension. Fifth International Conference on Philosophy in Practice; Wadham College, Oxford. June 10-11, 1999.
- ↑ Siskiyou Youth Press Release http://www.siskiyouyouth.com/cos-philosophy-instructor-has-ties-to-olympics/
- ↑ Quote: Dressage in the Fourth Dimension http://www.illusionga.com/schedule_body.htm
- ↑ Spring Brook Farm http://farmerruth.com/clinics.php
- ↑ Dressage Journal http://www.ensignsgrace.com/News1.html
- ↑ New Gait Manor http://newgaitmanor.com/clinics.html
- ↑ YogaRider http://www.yogarider.com/aboutus/bios.html
- ↑ Philosophy, Cosmos and Culture http://cosmopolis.com/inst/index.html
- ↑ Thistle Hill Farm http://www.thistlehillweavers.com/thistlehillfarm/