Fun with optical illusions...

[jmcc]

I know I've seen similar before, but hell if that doesn't blow my mind: http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html

[Ledhed]

Holy shit. When I saw the title of the thread, I immediately thought of this. I first saw it on Ebaum's.

[Rodimus]

That's pretty cool.

[D4rkewolfe]

This one is my favorite http://www.funnyjunk.com/p/0296-gif.html

[Ledhed]

Here's another one that I'll never figure out.

http://www.ebaumsworld.com/trigrid.html

[Mr Unoriginal]

Here's another one that I'll never figure out.

http://www.ebaumsworld.com/trigrid.html

From where comes this hole?!

[jmcc]

Here's another one that I'll never figure out.

http://www.ebaumsworld.com/trigrid.html

Ah yes. I was introduced to this one in HS geometry. It taught me that polygons with unmarked angles or measurements are damn dirty liars.

[jmcc]

Here's another one that I'll never figure out.

http://www.ebaumsworld.com/trigrid.html

From where comes this hole?!

Seriously? Look closely at the hypotenuse, it's not straight. It's either very slightly concave or convex depending on how the red and green triangles are arranged.

[Ledhed]

Ah yes. I was introduced to this one in HS geometry. It taught me that polygons with unmarked angles or measurements are damn dirty liars.

Would you mind elaborating? Do you actually know the answer as to why there is a hole, or were you joking? I aced geom. in HS, and I don't remember anything that could explain this.

EDIT You posted the answer as I was typing this.

[guessed]

I know I've seen similar before, but hell if that doesn't blow my mind: http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html

There is a link on that page to some other similar illusions: http://web.mit.edu/persci/gaz/

[Scrubking]

Here's another one that I'll never figure out.

http://www.ebaumsworld.com/trigrid.html

From where comes this hole?!

What is so mind bending about that?

The shapes arranged one way don't have a hole and another way they do - the only mind bending thing I see is how people don't accept that it has a hole just because it is the same shape when rearranged.

[jimbodan]

Here's another one that I'll never figure out.

http://www.ebaumsworld.com/trigrid.html

From where comes this hole?!

What is so mind bending about that?

The shapes arranged one way don't have a hole and another way they do - the only mind bending thing I see is how people don't accept that it has a hole just because it is the same shape when rearranged.

I agree with you on this, it's really not all that mind bending. The shape that replace the one on the top is bigger then the original and it throws everything else out of wack. The two original pieces on the bottom only fit together with no gaps one way.

[guessed]

Here's another one that I'll never figure out.

http://www.ebaumsworld.com/trigrid.html

From where comes this hole?!

What is so mind bending about that?

The shapes arranged one way don't have a hole and another way they do - the only mind bending thing I see is how people don't accept that it has a hole just because it is the same shape when rearranged.

The interesting thing about it, is that, if you look at it, the endpoints of both the shapes formed are the same, meaning that, if the lines truly were straight (as they appear to be until scrutinized), the area of the top triangle would be equal to the area of the bottom triangle plus the area of the hole -- in other words, using pieces of equal area to form a triangle with a smaller total area, which is, of course, not possible. The apparent loss in area is accounted for by the curvature of tangents of the green and red triangles.

Edit, to try to clear it up a little more: It is not that it is surprising that a hole could be formed by rearranging the shapes, but that two apparently identically sized triangles could be formed, one with a gap, one without, from the same exact pieces -- an apparent loss of surface area.

[karmapolice]

this is my favorite: http://www.ebaumsworld.com/updown.html

[Scrubking]

Here is a really good site for illusions and stuff.

www.sandlotscience.com

And here is a better version of the checkerboard illusion. http://www.sandlotscience.com/Contrast/Contrast_frm.htm

[jbroush99]

this is my favorite: http://www.ebaumsworld.com/updown.html

I think I just got a migraine

[Scrubking]

And here is the answer to the hole in the triangle paradox.

SPOILER
http://www.sandlotscience.com/Ambiguous/vap_2.htm

[Slipknot9762]

thats is cool

[kaw]

No, it's not an animated gif: http://www.funnyjunk.com/p/insaneillusion-jpg.html

[moiety]

this is my favorite: http://www.ebaumsworld.com/updown.html

What's the name of the artist who does paintings like these? Like the one with all the stairways going up and down and upside-down, etc...

[jmcc]

this is my favorite: http://www.ebaumsworld.com/updown.html

What's the name of the artist who does paintings like these? Like the one with all the stairways going up and down and upside-down, etc...

http://www.mcescher.com/

[jmcc]

Also, it's camera trickery, but still cool: http://www.lipsons.pwp.blueyonder.co.uk/escher/ascending.html

[karmapolice]

jmcc is right...it is Escher...one of my favorite artists...If you didnt know he painted with math...All of his drawings and sketchs are done with mathmatical formula's...If you look at some of his work and the math that went into it...I get a headache aswell when I look at both

[Kaijufan]

this is my favorite: http://www.ebaumsworld.com/updown.html
Where can I find more pictures by this artist?

[daphatty]

No, it's not an animated gif: http://www.funnyjunk.com/p/insaneillusion-jpg.html

Here's a slightly cleaner version of this one.

http://www.cs.toronto.edu/~moraes/illusion.html

[karmapolice]

I dont know who made that...but all they were doing was imitating a escher and put color into it...just look up MC Escher...Or go to the library and get a book

[1SwtDeception]

all the illusion hurts @_@

[Moxio]

I know I've seen similar before, but hell if that doesn't blow my mind: http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html

Seen it before, but it's still really interesting. The colors don't seem to match at all.