What really drew me in to take this image was the contrast of the blue and white. I'm used to seeing black drains, not nice ones like these. I was also quite lucky with the sky being so blue and not having any clouds in the way. The colour runs straight from the sky all the way down the drain, from the top of the image to the bottom. The oddly sized windows give it character too. Because it's in the middle you are immediately drawn to the bigger window, completely disregarding the smaller windows existance.