 Feature stimulus class. It's a stimuli that has a common physical form so a Series of tables we have a nice wood table, but you can have a plastic table and a metal table and a Rope table, I don't know. That's really weird. I came out of nowhere. Anyway, you could have people with long hair You could have people with no hair and that's Still people still stimuli still part of a class You can have plastic cups and wooden cups and metal cups and the wrong type of cups and Yeah, it's a stimulus class. Just think it's for a feature stimulus class So it's literally think features think physical think What is made of what the structure is there you go