Designed by Johann Bernhard Fischer von Erlach in 1726, the 80-meter Prunksaal is an imperial memory palace housing 200,000 leather-bound volumes under Daniel Gran's dome fresco of the Apotheosis of Charles VI.
The full decipherment and its observational protocol — where to stand, when, and what to watch for — are in the Vienna field codex.
Or read the complete Florence codex free first.