It all starts with how similar shapes are put together and shows two different views from the object, making it seem like there are more shapes than there actually are. Our brains are trying to fill in the spaces with the two objects that we are seeing. These shapes can also be put together by connecting different corners of shapes, however it might take a few tries to get it to look like there is more than one shape in the figure that you created. When you look at the bottom of the elephant you would see 5 legs and when you look at the top of the elephant you see 4 legs. Our minds are tricking us on seeing two different things at once but out of our preferrial vision.
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"Impossible Objects." MoreThanMathscom. N.p., 02 Jan. 2011. Web. 18 Mar. 2015.
"BrainDen.com - Impossible Objects." BrainDen.com. N.p., n.d. Web. 18 Mar. 2015.