This book includes a brief history of stereo photography, also known as 3D. There is a gallery of 100 stereo photographs taken in 13 countries by the author. A pair of special glasses known as a lorgnette viewer is necessary to view the images in 3D. These are included in the price, but can't be supplied by Blurb. When ordering the book, forward a copy of the email receipt to email@example.com, along with your mailing address. I will mail the glasses directly to you.