No this is not a mistake.
What you are seeing is how Stenography works.
or aka 3D . I thought I would writhe this story because for many years this technology has been around.
I was first introduced to it while attending timber lake Job Corp.
My forestry instructor Dan Millard Introduced me to Stereo Maps or 3d maps.
the maps had some circles that represented the peaks and valleys and such. those were the simple ones, once one eye was trained one went on to more elaborate 3d maps that were pretty well detailed.
any How this technology first came out in 1835 or some where in that time frame. hey I am just writing this story, you go and do the research :)
I am here just to spark your curiosity and to raise your awareness.
Companies are coming out with 3d tvs and they expect consumers to pay big bucks for them.
this technology isn't new and every thing from Cross eye (which is in the format that the above video is in) to IR shutter glasses.
many past gadgets were ahead of there time. and contrary to belief one no longer needs to have 2 cameras all one needs is software like stereo movie maker. just google it and you'll find it. how ever this program will create a very large file which will need to be re-encoded to upload to a sight such as this.
Ok Now for a special note on this you will need to relax your eyes and then focus on the center image .
enjoy the incoming rain storm :)