The urge to hang upside down, get the view from under the table or on top of the dresser and other actions that are part of the ORIENTATION schema. In order to 'know' what it is like to hang upside down or see things from a different point of view you must take yourself into those positions. Although you and I might not hang upside down very often these days we still 'know' what it feels like to hang upside down - because we have the experience - we learned what it was to hang upside down when we too had our ORIENTATION urge kick in.
