I had seen this some time ago, and truly envied the skills of artist who did it. I was not sure how I had come across it, but began to look for it on the web, and found it in several places. At the One Drawing Challenge 2021 [link], I learned that it was not the interior of a ruined church, as I had supposed, but of the abandoned Cardiff Coal Exchange in Wales. (A capriccio is an architectural fantasy.) As I followed the thread, I found that this capriccio was part of Dan Liu’s 2014 Master Thesis Project (which better explained why I had seen it before). A 26-page presentation on the project is available at issuu [link] where Liu posted it in 2014. His BSc portfolio is also available on issuu [link].