        consider just certain parts of the eye to be sensors.<br />
            <b>guid: </b>bd589e5a-9c29-11b1-9dad-c379636f7270<br />
            <b>direct instance of: </b>
            <a
            href="./top-vocab.html#ExistingObjectType">#$ExistingObjectType</a>  <br />
            <b>direct specialization of: </b>
            <a href="./top-vocab.html#PartiallyTangible">#$PartiallyTangible</a>&nbsp;&nbsp;<br />
            <b>direct generalization of: </b>
            <a
            href="./percept