Studies have shown that the human eyes are not adapted enough to deal with 2D images. When looking at a moving 2D image the eye reconstructs a 3D based on what it sees.
According to Abhishek Satheesh, it all depends on how your brain construct 3D image based on 2D clues from the image. Just try watching the video below a couple of times.
You may notice that each time, the initial direction of spinning was different. Why does the eye movement from left to right gives different direction? The reason is that the video is in reality, a 2D image shifting back and forth.
Our brain has not evolved to deal with 2D images, so it takes clues from the image to reconstruct a 3D model. This happens in the visual cortex, it scramble along and try to make sense of what it sees. Either direction of the rotation works, so whatever is found first, it will stick, unless you refocus and give the visual cortex a chance to come to a different conclusion.
This idea came true in a first trimester scan I did with low resolution ultrasound machine few years ago. I mistook the movement caused by the rythmic breathing of the patient for fetal cardiac activity in a 9weeks fetus. In reality there was no cardiac activity but the rythmic displacement created a false appearance of fetal heartbeat.
To deal with this shortcoming, screen resolution and scanning skills would come in handy. Which has alrralr been taken care of by present day high end Ultrasound machines
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