I looked around the web a bit and found this article by Bev Marshall -

"Eider ducks are only found in the North Atlantic in Iceland. The mother duck plucks her own down to feather the nest to keep the eggs warm. The down is then harvested by hand after the next has been abandoned. This is very labor intensive as you can imagine. Any eider down comforter is considered heirloom quality since they are so rare.

Bev Marshall is a successful freelance writer, Aromatherapist and Feng Shui consultant offering guidance and suggestions for consumers buying a comforter, bedspread, baby bedding, duvet cover, bedding and more.."

http://www.downcomforters-online.com/goose-down-comforters--warm--cozy--...

So it seems that down duvet is very Feng Shui when we think of its concept - "Feng Shui is an ancient Chinese philosophy. It is the study of living in harmony and prosperity with nature. It is a form of geomancy, trying to understand the relationships between nature and ourselves so that we may live in harmony within our environment. It is based upon the simple thought that our lives are deeply affected by our physical and emotional environment."

Feng Shui has advice and solutions to offer, in order to let the "chi", the energy, flow smoothly around the house. Curtains and windows, fabrics, color, material, window arrangement, yes, all these may affect your homes chi ~