Seasonal are new color options or new styles that are only offered for that season. Seasonal allows me to create a new line that corresponds with my classic. New colorways are batches of glaze I make for the season and if I run out, I run out that season. The beauty of seasonal, is that it is a reminder that these items are not mass produced and that when you like something you should get it while you can.
Seasonal are usually curated items based on that current season broken up from Spring/Summer and Fall/Winter. While that may mean for most companies that they cater their color palette to the season, instead seasonal for me means colorways I can’t guarantee from season to season. It allows me to make something unique or play with something temperamental while not going crazy.