Laura Diaz-Arnesto, who is the author of some of the most popular blog articles (see below) got in touch to tell me that the Metropolitan Museum of Art has made available the complete book – Age of Spirituality: Late Antique and Early Christian Art, Third to Seventh Century – available online. It is based upon their successful 1977 exhibition.
It is not so easy to read it this way but with a large screen it should be ok. I think the book is out of print so this is a good opportunity to read it.
Access it here.