I'm confused when I study potential wells. I understand that when E<V0 there are eigenstates and only certain values of energy. I can express this condition with an equation and eigenfunctions. However, if E>V0, it's not bounded and all values of energy are possible. This, I don't understand. It is true that the sprectrum can be discrete or continous but how would you explain this with a example, say the finite potential well. Thanks.