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In the first hidden layer, you might find one neuron that is looking for the low vertical line or a vertical edge like that. A second neuron looking for an oriented line or oriented edge like that. The third neuron looks for a line at that orientation, and so on. In the earliest layers of a neural network, you might find that the neurons are looking for very short lines or very short edges in the image

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so does the first neuron looks for a low vertical line at a particular position or at any position.does it check for low vertical positions at all positions.i understand its looking for a vertical line,but where does it looks?if its at a particular position? there can be a vertical line at some other position p2 also,so is there an other neuron looking for low vertical line at p2? is each neuron linked to a specific positon ?