Vitruvian Man

On successfully solving the puzzle, the Eastern Shiva is replaced with the Western Vitruvian Man. Inspiring one of Leonardo Da Vinci's canonical works, Vitruvius was a Roman architect who broke down the human figure proportionally, and tried to fit those proportions into circles and squares. Da Vinci checked it out for himself, and sketched his own diagram of it, as you can see below.

Roger has mirror-image reversed his usage of the Vitruvian man figure - probably to celebrate Da Vinci's mirror-image writing. The "real" figure must be reversed, as well - right?

From the Shambhala book, we find that Tibetan mysticism calls out 5 chakras (or 'centers') - different from the 7 that Indian Buddhism seems to call for. Maybe Tibetan Buddhism is more conservative:

We will work our way up - when you select the 'secret' chakra, you go to the Wheel of Apposition:

 Here we have the 'Wheel of Apposition', where apposition is defined as, "the positioning of things or the condition of being side by side or close together" - reasonably descriptive here. The Sun graphic is vaguely medieval and alchemical, not canonically famous.

For the message on the sides of the graphic, you go 'in-to-out' to decode; in this case, the message (clockwise from top right) is:

'use only the first letter of each worj'