Houses the Imperial Crown of the Holy Roman Empire (crafted in 962 AD with 144 gemstones and 12-stone pectoral plate) and the Holy Lance (Spear of Longinus), embedded with a nail from the True Cross.
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.