If you watch a car drive away from you down a straight road, it appears to get smaller as it gets farther away. We know that it doesn't *really* get smaller, it only *appears* to get smaller. So we distinguish between the real size of the car and the apparent size (at a particular distance). I have two problems with this. First, at what distance do we see the real size; or, at what distance does the apparent size equal the real size? Second, the real car is supposedly outside our heads and the apparent car is supposedly an image of the real car, and inside our heads. But the car we actually see is (a) outside our heads, so real, and (b) changing its size with distance, so an image inside our heads: but how can it be both?