Doors of Perception: Icons and Their Spiritual Significance by John Baggley 
 
Doors of Perception by John Baggley is a richly illustrated and deeply insightful guide to the spiritual and theological meaning of icons within the Orthodox Christian tradition. Far more than decorative art, icons are presented here as windows into the divine, designed to invite contemplation, prayer, and spiritual transformation. Baggley explains the symbolism, liturgical function, and mystical depth of these sacred images, helping readers see icons not just with the eyes, but with the soul.