13. Copying (forging) a signature Herman Darvick You will tend to write in your own style – hard to avoid Only copy shapes, not letters Upside down To be copied
14. Confusing – what is this? Good – have an open mind about what you are seeing
15. Rotated picture Here we use familiar sights to interpret and understand the picture, But the picture has not changed. Our perception has changed Bad – we see much more, like intended use of the water, than is really there. It is just water – the swimming use is what we bring to it.
37. “ natural ” way to think – right eye sees image on right, left eye sees image on left “ Unnatural” way to think Equally useful alternate arrangement – but must switch paintings positions
38. Dec 2007 / Slide Effect on viewer of reverse stereo
39. Try to identify assumptions about limited choices
40. New type of stereo viewer Arrangement when not in use and folded up Works both ways, but having crossed lines of sight gives more room for eyes and larger field of view. Crossed lines of sight Ray path does not give usual color or distortion of prisms
42. Eye pupil Outside of door Door viewer optics – strong negative power Extremely wide angle rays Inside of door
43. Eye outside door looking in Can’t see inside because of extreme vignetting – rays miss the eye Can only see a very narrow angle through the optics Optics pupil is inside the system, where eye can’t get at it
44. Used by police and firemen. Also spies and voyeurs But there is a sneaky way around this!
45. Actual system Door hole viewer eye Peephole Reverse Viewer Door width
49. eye Move these optics towards right and match up pupils That effectively then puts eye completely to right of the door viewer, and inside the room Relayed image of eye Door width
50.
51. Maxwell’s Fish Eye (1854) a gradient index ball Every point on surface of ball is imaged perfectly to opposite point on ball Ray paths inside ball are arcs of circles n = 3.0 at center, 1.5 at outer rim
52. Hidden assumption in this drawing Rays stop at point #2 But in reality they would total internal reflect there and continue on Point #1 Point #2
53. Actual ray path Reflects here at surface of ball Starts here Returns here, reflects again, and goes around forever