…and no they are not like stripper-grams!
Some of you may know I once planned to become an optician…well I decided it wasn’t for me but thats not to say I am not still interested in perception, vision and optical illusions.
One of these perception tricks is 3D. Here are a few photos that show a funky type of stereoscopic vision.
Traditionally stereograms are photographs taken slightly apart from one another at exactly the same time, as our eyes would do. Then the left photograph would be presented to the left eye and the right photograph presented to the right image with each eye occluded from seeing the other eyes image. Our brains see the two images and merge them together to see a three dimensional image using different visual clues within the images and differences between the two.
One of the ways our brains do it is that objects viewed far away in each eye don’t appear to have much movement when you swap between them however objects close to you move a lot more. You can see what I mean if you hold your finger up in front of your nose and focus in to the distance now close one eye at a time your finger will jump a lot when you change eyes. Extend your arm and repeat still focusing in the distance…it will jump around a lot less.
The stereograms above are examples of a different type of stereogram called Wiggle-grams which flips between the two images rapidly. What interests me is that the stereo images are not separated in space as normally would be but in these type of stereograms are separated in time. The brain still reads three dimensional information from this.
Even if you don’t appreciate the science behind it you have to agree they look pretty cool.
There are a few old stereogram cameras and examples to see at The National Media Museum (formally the National Museum of Photography Film and Television) in Bradford, Yorkshire.