Class and object : Do we really understand these basic OOP concept?

If i tell you you know what are class and object but you probably will fail to link them to real world, will you agree?
Don’t believe too early?
Answer this, have you seen any Bike, Bike is class in real world? (Answer it in programming)
General answer — Yes,
Actually — No, You only can see object of Bike class, i.e. Hero honda splendor

:)
So, answer me another one, Have you seen any Flower, if Flower is class in real world?
— — Exactly.