Slow animated GIF

WFMU RadioVision festival last weekend in New York City. It was a thrill to meet station manager Ken Freedman after all these years, too. During his talk, Ken displayed a photo of Keir Dullea in his space helmet from 2001: A Space Odyssey. I thought it was a static image, but once every 90 seconds or something happens. It was fun seeing people in the audience do a double take when they noticed it.