No illusion here. This is the real deal operating at 15 kva or 15000 watts. Every now and then I have to place a non illusion post up because the name is Optical Illusions Etc... This tesla coil was created by David Riebens.

My favorite Tesla Coil. ClintLightning@Aol.com
Flickr Artist: tesla1000Night time home made lightning must wake the kids and get the dogs barking.

Kens coil.
Flickr Artist: tesla1000
This optical illusion is very well done. Can you guess the exact nature of this construction.
Hint: Not all seemingly 90 degree angles are even close to 90 degrees.

side by side???
Flickr Artist: erik minnema
I love good silhouettes. They are almost always ambiguous. When dealing with a silhouette the subject can be looking toward you or away from you and the lines can be drawn in to show either perspective.
Which way is this lovely girl actually facing?

P2 - Beach 3
Flickr Artist: ZaksterNT
This is an ad for ramen in the causeway Bay Station in Hong Kong. I love this kind of art. I would love to see this from a angle that reveals how distorted this image needs to be to get this one perfect view.

Trompe d'oeil Ad
Flickr Artist: djwerdna
Here is an interesting photograph. This photo was not manipulated with Photoshop or any other photo manipulation software.
How is this illusory effect accomplished?

Optical illusions
Flickr Artist: zm
Here are a couple of fascinating creations by artist Peter Callesen the first creation is a closeup of the original piece. The only material used is Acid free paper, pencil, and glue.
I love the skill and creativity of this artist. Is this skeleton breaking free of his two dimensional chains or settling in for a nice long nap.

Half Way Through (Detail view)
Peter Callesen
(c)2006
This image is also just paper and glue. Makes me yearn to be a kid, just to have the chance to play with the glue again. Check out Peter's other works at his site.

Looking back
Peter Callesen
(c)2006
Peter, You do great work. Well Done!
Here is a digitally manipulated photo created in the style of M.C. Escher, purposefully designed to make you question which way is up. How many different photos were used in creating this photo?

Which Way
created by sirchopsalot
@ PSTKudos to Sirchopsalot for a wonderful creation.
Below is a montage of the original images used to create this very interesting Escheresque image.
If you guessed nine different photos, congratulations you are correct.
Again I take you into the Etc... of Optical Illusions Etc... Not everything in this blog is an optical illusion, some of it is frightenly real.
On August 11, 1999 a mysterious black mass swarmed across the surface of the planet. This might be biological in nature if it wasn't for the fact that it moved at almost 2000 kilometers per hour. Could this be extraterrestrial in nature? Is this phenomenon proof that we are being visited from other worlds?

Credit: Mir 27 Crew; Copyright: CNES
source
Explanation: Here is what the Earth looks like during a solar eclipse. The shadow of the Moon can be seen darkening part of Earth. This shadow moved across the Earth at nearly 2000 kilometers per hour. Only observers near the center of the dark circle see a total solar eclipse - others see a partial eclipse where only part of the Sun appears blocked by the Moon. This spectacular picture of the 1999 August 11 solar eclipse was one of the last ever taken from the Mir space station. The two bright spots that appear on the upper left are possibly Jupiter and Saturn, although this has yet to be proven. Mir was deorbited in a controlled re-entry in 2001
This film is the creation of Yutaka Akita. This short film has bits and pieces of many favorite illusion topics such as recursive, fractals, tessellations, and perspective. He describes this video as follows:
"This is application experiment of optical illusions commonplace in 2-D animations in 3-D spaces. The animation develops through illusions caused by concurrent different perspectives of simple lines and surfaces. It is a non-narrative film aiming to make viewers feel bizarre yet fascinated by a feeling of floating between real and unreal."
For more films from this artist go to this site. Here is a short biography he provided on his Dailymotion page.
"Born and bred in Yokohama, Japan. After a study of Byzantine art at Waseda University, surprisingly Yutaka started his career in the film industry where crazy yet creative people are working hard every night and day to make something amazing. Couple of years after, he alone went all the way to the UK to cultivate his style and techniques as an animator/director. And here he is, working on a variety of projects including promotion video for Madame V spring/summer collection 2007, James Bryan “Beautiful World” video, etc. He also worked for Johny Mourgue, one of the film director in FLYNN Productions and made a pitch for Beck’s album “Cell Phone’s Dead” TV spot. *showreel available on requests."
If you had a need to boil water and only had a candle and a glass, what would you do? If you were photographer Georg Pillwein you would be creative and boil the water from inside the glass.

Fire and Water
(c)2004
Georg Pillwein
Used w/permission
Having the flame directly in the water has to be a very efficient way to transfer energy to the water. I only wonder why other folks didn't think of this earlier.
If you wish to use this photograph or any other that Georg has on his site drop him a line.
The following are actual photos of smoke, true some post processing was done but everything you see in these images is photographed smoke. These are the work of Csaba Mészáros of Budapest, Hungary. I asked him permission to use the "Intimacy" image and he suggested two others. The most amazing of the three is the one below titled "Mom and Baby".

Mom and Baby
(c) Csaba Mészáros 2005
Used w/permission
You can read a brief biography on Csaba and find out exactly how he accomplished these amazing images in the January 2007 issue of
PBase magazine.
Here is a short starter explanation he gave in a comment a couple years back, "The setup is quite simple: the smoke comes from incense sticks (made in India), they are cheap and produce a constant smoke for a long period of time (and also a pleasant scent). The light source is a fashgun from side and behind. You need a black material for the background and something to shade the direct light from the flash to the lens. Plus some patience and some trials. "

Intimacy
(c) Csaba Mészáros 2005
Used w/permission
In the above image "Intimacy" two separate photos were merged into one during post processing to complete the duality of a male and female.

Apparition
(c) Csaba Mészáros 2005
Used w/permission
Csaba, Thank you for sharing your images here. You can find more photos of his on PBase.
This was a truly interesting photo. No digital manipulation, just a straight up old fashioned photograph.

motel illusion
Flickr Artist: źéń
See more of his photos
at Zenography
So how do you think this was accomplished?
The photographer only says this about the image, "Taken from the pool at the Duke Inn, VA".
Now you know what I know. Exactly how was this done?
Here is an anomalous motion/distorted perception illusion.
The apparent motion induced by the blue spots seems to cause the red lines to bend and wave. If the whole image is in motion how could red lines not be bending with the motion?
These types of motion images confuse the eye and brain. This confusion allows the viewer to perceive motion in a static image. That's right the below image is a static image and is not animated in any way.
Herman has an excellent collection of Pop art, Paintings, and Optical illusions. He has given me permission to feature his pieces here. This is just one of many. His illusion art ranges from color perception to distorted illusions.
Thank You for sharing these excellent illusions Herman.
*** Herman J. Verwaal's Trick Art, Pop Art, and Fine Art are available for purchase.
The below unretouched real photograph reminded me of the above piece of art by Jos de Mey. Jos paints an arch that clearly can't exist in the real world. At least that's what I thought until I saw this photo. How do you think the effect in the below photo was accomplished

Locus of control
Flickr Artist: ilConte
Like the impossible triangle illusions of the past here is a modern day impossible object. Utilizing legos, a Sony Cybershot camera and some old fashioned know how the artist created this exceptional optical illusion.

Impossible!
by bbzippo
(c)2004
He isn't the first to create illusions out of
Legos. Andrew Lipson has done some amazing optical illusions using Legos...
Here is Escher's Balcony


(c) Andrew Lipson ........................ (c) M.C. Escher
Here is Escher's Relativity


(c) Andrew Lipson ................................... (c) M.C. Escher
The amazing aspect of Andrew's work is his behind the scenes photos and explanations go to his site and check out all of the illusions that he has created.
This came to my attention via Kisrael.com. I know what some of you might be saying, I said the same thing when I first saw it. "How the heck does this classify itself as an optical illusion? For that answer you'll have to read the full article.
This is very much like the Ferris Wheel optical illusion I posted previously, depending on how you look at her she will either be spinning clockwise or counter-clockwise. You don't believe that it is possible for your mind to see this image rotating any way but the way you see it now, do you?
One of the reasons that this is possible is that it is a silhouette and the very nature of a silhouette is ambiguous.
Try looking at the reflection and see if she reverses direction. I shift my focus to the side and can tell in my peripheral vision that she has changed direction, I then move my eyes back on the silhouette and walla she is rotating in the other direction.
What is even more amazing is that if you see her spinning clockwise then it is her right leg and arm that is up in the air, but if you see her spinning counter-clockwise then it is her left leg and arm that are up in the air.
My initial view of this illusion is that she is rotating counter-clockwise, but once I manage to see her spinning the opposite way it is hard to switch back. Which way does she appear to spin to you? Can you see her spin in either direction?