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At first glance it looks like stained glass!
Source with more pictures: “Glasslands, A Chinese Artwork” by Tobias Hägg (Behance)
RSS Feed *: https://www.behance.net/feeds/user?username=Airpixels
* Behance’s RSS Feed autodiscovery is broken and the suggested one is incorrect.
Thank you for the link, yet another rabbit hole to enjoy