There is a wonderful series of short videos called "Dimensions" created by Jos Leys, Étienne Ghys and Aurélien Alvarez. It is a strikingly beautiful series that is free for download or watching online. Since we finished complex numbers in HL Math in grade 12, I thought I would post the link to 2 chapters on the subject: chapters 5 and 6. The end segment on complex numbers contains some mezmerising graphics. Details on these chapters are also online if you would like to read more about the information in the videos. From the website: "One should consider these chapters as supplementary, as illustrations which encourage further learning or maybe as reminders of lessons forgotten long ago. Certainly the film tries above all to show clearly the geometric side of complex numbers."
Below is an image from the final sequence of chapter 6.
