Another step comprises adjusting, by the one or more computers, a configuration of the reflective optical surface so that each of the surface normals bisects the following two vectors: a vector from the local reflective region to its associated content area; and a vector from the local reflective region to the location of a center of {HEAD ~ rotation} of {TAIL ~ a nominal users eye} 
Another step comprises adjusting , by the one or more computers , a configuration of the reflective optical surface so that each of the surface normals bisects the following two vectors : a vector from the local reflective region to its associated content area ; and a vector from the local reflective region to the location of a center of { HEAD ~ rotation } of { TAIL ~ a nominal users eye }
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