Looking like a corner of a rehearsal space that would be used by Psychic TV in the early eighties(!), this is a photo of a Masonic 'Chamber of Reflection'.
Seeing as the masonic founders were big on all things alchemical, the 'vitriol' graffiti apparently alludes to the 'oil of vitriol' aka sulphuric acid, used to create the Philosopher's Stone.
(click image to enlarge)
VISITA INTERIORA TERRAE RECTIFICANDO INVENIES OCCULTUM LAPIDEM
Visit the interior of the earth and rectifying, you will find the hidden stone