Drawings of the Taj Mahal and Agra monument from the early 19th century
blogs.bl.uk
blogs.bl.uk
For me, it's the realization of the fact that the floral patterns decorating the building are not painting but made up from many varieties (apparently about 28 of them) of colorful gemstones and many of them are imported from outside India.
I've been working on my computer skills for over 30 years. And my guitar playing. My song writing. Hell, hundreds of other things. What else do you do with your life?