In an example implementation, tall structures in the array are light emitting and act as a light emitting visual display which further comprises {HEAD ~ an array} of {TAIL ~ vignetted light sensors} 
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In an example implementation , tall structures in the array are light emitting and act as a light emitting visual display which further comprises { HEAD ~ an array } of { TAIL ~ vignetted light sensors }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL