A digital component of the Atlas of Cardiac Anatomy is a set of 25 anaglyphs (stereoscopic images) that correspond with specific photographs in the book. Anaglyphs provide a 3D effect when viewed with 3D glasses (a red lens and a cyan lens). 

These anaglyphs are not included in the gratis digital edition (as they are with the purchase of the print edition) but are available as a separate eBook purchase.

3D glasses are not included but are available at various online retailers.

Samples:

Anaglyph 1. The heart viewed from the right anterior oblique direction