 One of the things that I am able to do is something called instance of. Instance of, now since we're able to put any kind of object in its hierarchy, what we can do is we can double check to make sure that something, some object, some data, some variable I made, is of a particular object. It is, say, a student. It is, say, a circle, or just to kind of change things up. It is a fruit. Say for example, we were to make a fruit class, a fruit hierarchy of, you know, fruit, very generic term, apples and oranges. We're comparing apples and oranges here, ladies and gentlemen, and apple, apple actually kind of has its own two classes that inherit from it, Golden Delicious and the Granny Smith. So what we can look at is, again, if we have some code, I've made a fruit and I've made an orange, all right, well, fruit. Notice again, we're using polymorphism. I can say this is a fruit, but because Golden Delicious apples inherit, inherit from fruit, I can make the generic version and create sort of that explicit version. The first one, is fruit an instance of fruit, and that should be capital F, so I'll fix that in a second. Is fruit an instance of fruit? Well, yes it is. Obviously, I got a little check mark there, but obviously it is. It is a fruit. Now, is fruit, is this guy an orange? No, Golden Delicious follow this food chain. They follow the fact that I'm an apple and a fruit. They don't ever touch the orange, so that one is incorrect. Again, if it's not following an orange, it's following this food chain. Look what I just crossed out. So obviously it is, it is a Granny Smith, because that's what we created it as, is a Golden Delicious. It's not a Granny Smith, because again, never touches that one. Same kind of thing. This orange object I created, is it an orange? Well, yes. The orange hierarchy goes up to fruit. So yes it is. Is it an apple? No. So one of the things I'm going to give you is a nice little quiz here, a nice little thought experiment. If I did fruit F equals new Granny Smith apple, is F instance of object? Pause the video, maybe find out. You can actually take some of this code. You can take this, for example, and check. So is it yes or no? Yes it is. Because again, if we follow the full spectrum of the inheritance chain, fruit isn't the end all be all. Object is everything in Java is an object. So guess what? Fruit is an object.