Pluto Slice Stereo Cross Eyed 3-D
Taken by Philip Smith on July 15, 2015 @ Manorville, NY, USA
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I copied the NASA High Resolution Pluto slice image.

I thought it would be nice to make a Stereo Cross Eyed 3-D image from it.
How to do it

Why crossed eyes?
When overlapping stereo pairs without special glasses, you can get the 3D effect by crossing your eyes or diverging your eyes. I prefer the crossed eye method. I find it easier to control, and it is possible to view larger 3D images than with the diverging technique.
Sit square in front of your monitor, with the image directly in front of you, at about arm’s length
Sitting further back makes it easier – you don’t need to cross your eyes as much – but makes the image look smaller
Make sure you keep your head level horizontally, tilting your head will prevent you from merging the images
While keeping the stereo pair of images in the centre of your vision, slowly cross your eyes
The stereo pair will go out of focus and you will seem to see four images, as shown in the animation above
If you find it hard to cross your eyes, it can help to hold a pen in front of you and look at the tip with the stereo pair in the background
Gradually cross your eyes more and more – if using a pen to assist, start it close to the monitor and move it towards your nose
Continue crossing your eyes more, untill the centre two of the four images overlap and you see three blurry images, as in the animation above
Try and hold the centre image together – it is possible to “lock” it in place and see it as one image
The “locked” centre image should appear in 3D!
Now the tricky part, focus – while holding the 3D image in place, relax your eyes – drop the pen from your field of view if you are using it
If you can keep the 3D image locked and relax your eyes, it should eventually pop into focus, as in the last frame of the animation above

What you are doing here is causing your eyes to look at a space between you and the monitor, but focusing the lenses on the monitor. Our eyes never naturally need to do this, so it can be tricky to do at first.
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