While we are on summer break, this is a re-air of a popular episode from earlier in the year.

Can you think of a work of art that truly thrilled you? Maybe you can—and if you can, maybe it even literally made you shiver, or sent a chill up your spine.

This is the phenomena that is called “Aesthetic Chills.” It’s tied to strong emotional reactions to music or dramatic moments in fiction, or even to works of visual art. The effect is a bit mysterious, though it’s also associated with some of our most memorable art encounters. What does it mean for an artwork to be literally “spine-tingling?” Why does it happen when it happens, and why is it so rare? Ben Davis wrote a two-art essay last year on this fascinating phenomena.

Ben’s essay argued that this was more than just a technical subject. He thought that it might even point towards some vital parts of what make art important in our lives that don’t get enough attention. Based on the reaction of readers, many seem to agree—we also published an essay of readers responding with their own examples of artworks that had the effect on them.