clorophilla

here I am, with a quick pic for explain you the idea.
I invite you to play with sight jokes.

my pic: http://www.thinkdraw.com/picture.php?pictureId=114633
you can see that the face of the cube more close to your view changes, sometimes is A-B-C and sometimes is B-C-D (I omitted the 4° corner for not spoil the pic). And the yellow spot can lie (or may be can be a liar?!) on one or another face, both in the front and back view.

I explored the gallery and found many intersting exemples that sow unlimited possibility, I'll post them very soon!

clorophilla

optical illusions:
my last pic, and this:
http://www.thinkdraw.com/picture.php?pictureId=31006

hidden figures:
http://www.thinkdraw.com/picture.php?pictureId=101790
http://www.thinkdraw.com/picture.php?pictureId=69155

those are exemples in wich the perception of a figure excludes the other, and the view swich alternately from one to another.

reversion figure/background:
http://www.thinkdraw.com/picture.php?pictureId=86946
http://www.thinkdraw.com/picture.php?pictureId=50466

same figure, different gestalts:
golf player/ancient spartan mask: http://www.thinkdraw.com/picture.php?pictureId=107321
young lady/old crone http://www.thinkdraw.com/picture.php?pictureId=71806

fractal patterns
http://www.thinkdraw.com/picture.php?pictureId=100189
(form more info see here: http://en.wikipedia.org/wiki/Fractal)

impossible figures:
http://www.thinkdraw.com/picture.php?pictureId=79782
http://www.thinkdraw.com/picture.php?pictureId=36571
(for more info about the great Escher, here: http://www.mcescher.com/)

and so on...
feel free to copy famous optical illusions or to create new ones, and enjoy!
the challenge will end on 14° of this month (I give a bit more time bc many people is on holidays).

Arw65

http://www.thinkdraw.com/picture.php?pictureId=114638

Normal

The in & out cube is used by physicist Fred Alan Wolfe to illustrate his book "MIND INTO MATTER."

"The complementarity principle says that the physical universe can never be known independently of the observer's choices of what to observe."

Something we can notice a lot on ThinkDraw!

clorophilla

yes, one of the aims of this challege is exactly to realize how much the viewer is not the eye, but the mind!

clorophilla

you have to rotate a bit for seeing one of another of them!
http://www.thinkdraw.com/picture.php?pictureId=114787

clorophilla

this is another kind of optical illusions: Stereograms.
I'm aware this is a poor try, but it's my first attempt, and the "canvas" is too little for a good result - and I guess I did some mistake, but it works a little! let me know what do you think!
http://www.thinkdraw.com/picture.php?pictureId=114805

for more info: http://en.wikipedia.org/wiki/Stereogram

suzze

http://www.thinkdraw.com/picture.php?pictureId=114824
Find: The sorting hat, wand, broom,goblet, snake, ghost, owl, and rat.

clorophilla

I can see many hidden figures but I don't say where, I don't want to spoil the fun for other people! eh eh

Dragon

Here are 2 that Robindcr8l did a while back. I hope she doesn’t mind that I posted them for her. The second one you have to go in and follow the instructions but it’s really cool!
http://www.thinkdraw.com/picture.php?pictureId=72616

http://www.thinkdraw.com/picture.php?pictureId=77238

mum23

Here's another 'old' one - if these challenges act as a mini-showcase, I thought I might as well add it to the collection!

http://www.thinkdraw.com/picture.php?pictureId=110543

clorophilla

I remembered it and searched it thorough your gallery, but I didn't find it... thanks mom!

I hope that you could do something new the next week!

five

Thought this would interest you:

http://www.visualillusion.net/

hanging

This is Five's pic. You may find many different images.

http://www.thinkdraw.com/picture.php?pictureId=114915

clorophilla

http://www.thinkdraw.com/picture.php?pictureId=114968

Shanley

http://www.thinkdraw.com/picture.php?pictureId=114967
Energy

Shanley

sorry, I've just realized I pasted the link to the wrong page ... this was for Arw's challenge .

clorophilla

this by Artdillon is an old one, but it fits perfectly with this challenge!
http://www.thinkdraw.com/picture.php?pictureId=97184

clorophilla

2 days left... c'mon, submit your impossible pics, your challenges for our eyes!

and this is one more, for promote the challenge...
the impossible triangle of Penrose
http://www.thinkdraw.com/picture.php?pictureId=115381

for more info: http://en.wikipedia.org/wiki/Impossible_object

five

http://www.thinkdraw.com/picture.php?pictureId=115579