This image would probably still have been strong if shot straight. The contrast between the modern architecture of the station entrance with the older buildings around it, the artificial light with the fading daylight, plus the wedding couple dropped into an ordinary urban scene is intriguing. However by adding in the reflection, everything is doubled, everything is intensified, the couple become enclosed in a globe, like their very own bubble that excludes the rest of the world. We feel like the other characters can not even see them, let alone intrude on them. It's a very clever and beguiling image.