I meant to post on Shakai Tseng awhile back, but better late than never. Shikai Tseng decorates vases by covering them in photo-sensitive solution followed by capturing an image on their surface via a pinhole camera. Tseng then develops the vases in a darkroom like a normal photograph, the result being a record of the surrounding environment in which the vase was exposed, left permanently on the surface. I highly recommend watching this movie by Juriaan Booji on Tseng’s process.
View more of ShiKai Tseng’s work on his website.