![Luminous Glass Tower thumbnail](https://opn-web-afd-d3bfbkd5bcc5asbs.z02.azurefd.net/opn/media/images/imageoftheweek/2023/23-05-19.jpg?t=638430737490718837)
Luminous Glass Tower
Presented to friends for their wedding, a tower of champagne glasses filled with tonic water emits blue light by UV illumination.
—Kota Kumagai, Center for Optical Research and Education, Utsunomiya University, Utsunomiya, Tochigi, Japan