Ultimate curves - taken while on a photo walk in Shinjuku, Tokyo.
The key is to get close to the building to see the curvature of the windows and also use a fisheye lens to distort the view even more, of course, the photo was cropped a bit in the end to make it more imposing, and looks like a spaceship.
The reflection in the windows gives it away though.
2 stars on this makes me wamt to throw up one of my favorites so far