This is the first ever video from Nature | PBS shows a color-flashing octopus as it "dreams". ​ ​David Scheel, a professor of marine biology at Alaska Pacific University in Anchorage, has been raising a day octopus named Heidi in a tank in his living room. She recognizes her human caretakers and loves to play with Scheel’s daughter Laurel by chasing a ball on a string. But in this new video, Heidi shows signs of potential dreaming in what Scheel calls a “dramatic moment.” ​ ​In the video, Heidi