An interpretation of the writing of St Teresa of Ávila (1515–1582), who wrote an early conception of interior life titled "The Interior Castle" in 1577. Her castle of the soul was made of clear diamond or crystal and famously contained seven mansions through which one takes journeys of faith. Spong uses Teresa's text to explore the transition between apparent opposites. The central piece of Spong's installation art-work, "Now Spectral, Now Animal"