Not sure if this qualifies as a window or nature based... I thought i will still give it a try. This is from a historical monument in New Delhi - tomb of Emperor Humayun built in 1563 and has great architectural significance. Taj Mahal in Agra was built on the concept of this monument. Mughal architecture uses natural light filtered through perforated reliefs or window similar to this with view of the garden. I had taken this image in 2004. Just changed levels, adjusted for the perspective and applied Topaz Simplify. Hope you like it...


