... that while objects consist of three-dimensions the input received by the retina is purely two-dimensional. How does the brain turn this 2D image back into a realistic 3D model. When input is received by the retina it undergoes a process known as 'matching', in that the 2D input from the retina is matched to some sort of representation or category in the memory. But this suggests that a 'template' of that object is stored in the memory and when this object is seen again it is matched against this template. But there is a problem with this idea, if we took a picture of a tea-pot from a top-down view it would nothing like the view we would get from the side. Thus, if we have only one stored picture as a template, then this would mean that we surely could not recognise a teapot from a multitude of angles. ...

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