Final answer:
The brain needs light detection and image formation by the eyes, as well as processing in parallel pathways, to perceive a visual shape.
Step-by-step explanation:
The brain needs several processes to perceive a visual shape. First, the eyes detect light and form images. Then, the visual information is sent to the occipital lobe at the back of the brain for processing. The brain processes the visual information in parallel pathways known as the "what pathway" and the "where/how pathway."
The "what pathway" is responsible for object recognition and identification, while the "where/how pathway" is involved with location in space and how one might interact with a visual stimulus.