Oliver has a pair of these amazing glasses. If you look at Christmas lights (or, indeed, any bright light), each light appears surrounded by a shimmering circle of “NOEL.” The manufacturer says:
Multi-starbursts of three dimensional rainbows will burst into colour in front of your eyes!
And they do! It’s one of those amazing things that neither words nor photos can do justice. I just knew there was a good reason for not skipping the holography section of my last year in high school.