I think I understand what you're saying.
Actually, all I am implying is there is a common belief that at small apertures (f/22, f/16, etc.--that Tom referenced) maximum focus will be acheived. This is true when the subject and sensor/film plane are parallel. It is not true if there is a shift in the two planes, particularly if the subject is curved, rounded, staggered, etc. So one could shoot an object at f/16 and depending on the angle of the lens/camera it could appear as though it was shot at f/5.6* or lower. Shooting close-ups with blur is a no brainer, just about any camera or person will do this with ease. Shooting close up with sharp focus and maximum depth of field is a lot harder to acheive without a bellows or a tilting lens, when the sensor/film plane is not parallel to the subject.
*In this example the photographer "wasted" several stops by shooting at f/16, which almost by definition will require a lower shuttle speed to acheive the same exposure at a given ISO. This would introduce the potential for motion blur, etc.
And thinking about this for a nanosecond longer, the converse of what I said is also true: if the sensor/film plane and subject are parallel, why shoot at f/16 when the same focus could be achieved at f/4 thereby providing a lot more latitude in exposure?