You have to take off your shoes when you enter a mosque in Istanbul. It was great feeling, because my feet sank into the deep pile of a comfortable carpet. It was hard to tear one’s eyes away from the baroque ceiling of the Nuruosmaniye mosque in Istanbul, all light, and intricate arabesques. Paying attention to carpets is useful, especially when they are like this. The delicate blue of the carpet and the beautiful circular pattern under the central dome were enchanting. The windows admit beautiful squares of light that move across the carpet as you stand there.