Have you ever thought you heard something, but there was nothing there? Have you ever thought you saw someone in the corner of your eye, and when you looked there was no person there? Have you ever looked at an illusion and been deceived that one line was longer than the other, but really it wasn’t? When you look down from a high building on people, do they appear small like ants? Aren’t there thousands of occasions when we do mis-perceive?
If we are wrong on some occasions, for example, from a height people look the size of ants, is it not possible that we are always deceived? Logical necessity requires the answer: Yes, to this question. It is possible that things as we perceive them are not that way at all!