More on the mysterious Bosch and The Garden of Earthly Delights in particular (in the closing quarter of the article) can be found in [1].

See also [2] for an intriguing piece on possible gnostic symbolism in this painting.

1: http://www.nybooks.com/articles/2016/08/18/mystery-of-hieron...

2: http://www.digitaljournal.com/article/246864