good video. well worth watching for ANY private or ATR pilot out there. And know that as you get older, you're more easily confused. Chris in Winnipeg

Wow! Watched this very same FAA training film during primary training around 1984/85. Brings back great memories. Thanks for the upload.

Good vid thanks for the upload

Great Video!

Still very interesting, thanks for sharing!

It's about light/shadow phenomena and how your eyes can be fooled by it. When light shines upon one particular side of the humps and the other side is shadowed, they appear as dents, and the converse as well.

Holes, no. The "dents" are analogous to depressions, the "humps" are analogous to hills. That particular demonstration is merely to show how one can misjudge elevation by illusory visual cues.

gud vid..thx

Fum ... Patients with psychotic disorders may be fully oriented or exhibit a disorientation as to person that is at least as great as their disorientation as to time and place.

@Fuzkerendude I rember seeing a short animated video of what looked like the outside of a face mask lit by a light from top left, but as the mask slowly rotated it became clear the viewer was looking from the inside lit from the bottom right. Of course the use of 3D would have prevented the optical illusion but 3D is no good for far distance. Our eyes are too close together for infinite distance.

Where do you get all these videos??

Sorry, Fuz. I hadn't examined your profile so I didn't realize you're a Dane ;). "...cause to me it looks exactly the same." Well, perhaps lighting and shadows don't adversely affect your visual perception (?). But, for some others, it does unfortunately. Some folk will see a hill where there's really a depression (or hollow) whereas some will see a depression where there's really a hill, depending on how the light and shadow are cast upon the terrain as perceived by the viewer in question.

what is the lesson being taught at 1:50? that those two fields have diagonals of equal lenghts even though it might seem that AY is shorter than AX? this cannot be the case. it is clear that, since the 2 fields have the same width but differing lenghts, their diagonals cannot be equal. instead, their APPARENT lenghts would be the same from the angle they have been photographed, and this is the only fact the illusion is demonstrating (after removing the background and the construction lines)

i think this illusion is trying to say the opposite of what you should trust if you find yourself looking at two such fields and trying to judge which of them has a longer diagonal (such as when trying to establish and emergency landing spot). respectively, you should trust your instinct saying AY is shorter than AX any thoughts on this?

Hope that's a bit clearer ;).

RIP KOBE and GiGi