Quote from Cofty:
The answer to that question is easily available to you if you care to make the effort.
Unfortunately, from the technical engineering perspective, the answer to the question is not easily available. The ingenuity of the system design; the efficiency of the system design; the spectral response of the system; the presence of two sets of sensors to accommodate daytime and night-time conditions; the ability of the system to effect certain repairs to itself; the electro-control links of the system to other parts of the brain which enable both voluntary and involuntary reaction to certain visual stimuli; etc; etc; etc... Do you see the problem here? The tiniest details of the system, and there are many, are so incredibly ingenious! Biological electro-chemistry all tied together with incredible precision, order, reliability and astounding performance potential. The kinds of specifications which make engineers drool.