 Okay, maybe you say this, maybe you say, well, it's really hard to imagine how I could possibly be mistaken in this situation, right? When I'm sitting with something a foot and a half away from my face and I think I perceive it, it's really difficult to think of a situation where I've been mistaken in this regard. And Descartes can say, okay, but there have been some situations where you've been mistaken about your senses, right? Which your senses have told you has turned out to be false, right? Optical illusions, right? Maybe an optical illusion is something that's tricked you before. Maybe you've seen something in the distance that turned out not to be there, mirages are a common thing. Maybe you've mistaken the color of some buildings or billboards or scenery because of the time of day with the light or the atmospheric interference. There's some way that your eyes have misled you. If anybody here needs to use glasses, if you need to use glasses in some way, Descartes is already saying, hi, your eyes are infallible, right? If you've tasted something, have you ever done this, right, sorry this example curls your stomach, but suppose like you smell the milk and it smells fine and you pour the milk and you taste it, oh gosh, that's actually bad, right? Maybe your nose misled you in ways that your mouth did not, right? Maybe you felt something on your hand that you thought was just a tickle and turned out to be a wasp that was stinging you. Maybe you, you know, just trying to think of a variety of different ways where your senses might have fooled you. Maybe you thought there was some ingredient in the soup that turned out not to be there. You're deathly afraid of garlic or you're allergic to garlic and the soup has garlic and the soup has no, it doesn't have soup and doesn't have garlic in the soup. Yeah, there's food, right? This happens more than a little bit. You think the food is fully cooked, you eat it, yeah, it's fine. A little while later turns out not so much. There's all kinds of ways that you have made mistakes using your sensory input. Now you might say, but I haven't made a mistake when it's a foot and a half away from me. It's right here. I can't make a mistake about that. Descartes says that doesn't matter. You've made a mistake with your senses at some point. And that's enough to say there's some room for doubt with your sensory information, with that sensory. There is some room for doubt, not to mention, you know, all the ways that what you could be dreaming, you could be suffering from hallucination, you could be suffering from delusion, you could be hypnotized into believing that all these perhaps wacky, but possible ways in which you could form a belief that you're sitting in your room with the computer or sitting down watching your phone or whatever it is that you're doing. There's all kinds of ways, even presuming normally functioning sensory information is all kinds of ways. Your mind can be led to believe something that's false. And if you were suffering from those ways, if you were having a delusion right now, Descartes says you wouldn't know the difference because that's what it means to be within a delusion. It's not just somebody says, I'm feeling delusional today. It doesn't work that way. Wow, what a great hallucination, right? People don't do that. They think what they're saying is the real thing. So for Descartes, no, you can't trust your senses because not only have you made mistakes with your senses in the past, there's a whole variety of ways in which you have, you can be mistaken or have these judgments that are just off base.