“The people that raised me on TV and that representation was so essential for me to recognize that I could do it and there was a disappearance all of a sudden”: Since 2019, Issa Rae has been working on a two-part series that explores the history of Black representation on TV and how Black artists revolutionized the industry while confronting major challenges. The award-winning actor, producer and writer shares some of what she learned while making the HBO documentary, “Seen & Heard.”