The numbering is of my own design, and doesn't always correspond to seasons/series (although it does most of the time). I haven't separated the classic and modern series, as I feel such a separation is rather arbitrary. You'll notice some volumes have two covers. The main one focuses on a group photo of the cast while the variant is where I get more creative. I make them in random order, generally depending on my ability to find suitable pictures. I am considering making variants the back covers instead of separate alternative covers.