One of the advantages that Dickson's 68mm frame sized offered was the greater illusion of a three dimensional world. True, it's all flat images, but as hrses pass by each other, one of them is in front, covering the image of the other, and the mind interprets that as showing actual depth of perception. It's clearly an illusion, but there it is. There were other tricks the film makers could use to increase this effect; the most famous was the "Biograph right wall" which framed the image. But the clarity of the image here certainly conributes.
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