Let me get a bit mystical on you. This photo is from the old Bishop's palace in St David's, but the interplay of darkness, light and nothingness in the window reminded me of an early Mystic. In the 5th/6th century (Pseudo)-Dionysius the Areopagite wrote:
"..direct our path to the ultimate summit of your mystical knowledge, most incomprehensible, most luminous and most exalted, where the pure, absolute and immutable mysteries of theology are veiled in the dazzling obscurity of the secret Silence, outshining all brilliance with the intensity of their Darkness, and surcharging our blinded intellects with the utterly impalpable and invisible fairness of glories surpassing all beauty."
Says it all!