Path: utzoo!attcan!uunet!mcvax!ukc!reading!onion!reading!onion!henry!jadwa From: jadwa@henry.cs.reading.ac.uk (James Anderson) Newsgroups: comp.graphics Subject: Perceived size Message-ID: <930@onion.cs.reading.ac.uk> Date: 29 Jun 88 11:34:32 GMT Sender: news@onion.cs.reading.ac.uk Reply-To: jadwa@henry.cs.reading.ac.uk (James Anderson) Distribution: comp Organization: Comp. Sci. Dept., Reading Univ., UK. Lines: 18 In <350001@hpcvlx.HP.COM> ben@hpcvlx.HP.COM (Benjamin Ellsworth) writes: > A disc 3" in diameter at 10ft has the same perceived size as a > disc of what diameter at 100ft? Perspective projection provides an obvious, but almost always wrong answer about PERCEPTION. People, and many terrestrial animals, re-scale objects so that they approach a canonical size. Its called, "size constancy". It is terribly complicated, utterly un-programable, and leeds to lots of interesting discussion in psychology text books and common rooms! Sadly, I don't think you wanted to know that... James (JANET) James.Anderson@reading.ac.uk