The theory I am suggesting for 
all of form perception, not 
merely for the aspect of it 
affected by orientation, then, 
is that perceived shape is 
determined by the content of 
an unconscious description we 
make of objects. That 
description is a joint function 
of the object’s geometry and its 
perceived orientation, 
although other factors enter in 
as well.

    There is a seeming flaw in 
the entire argument presented 
here about orientation and 
form. If one uses certain kinds 
of material other than simple 
geometrical forms, such as 
pictures of faces or printed or 
written words, and conducts 
the experiment on head tilt 
described earlier but for head 
tilts of 90 degrees or more, and 
particularly for tilts of 180 
degrees, the outcome is the 
opposite of what I have 
maintained. To read print or to 
recognize faces, it is better to 
maintain the image’s retinal 
orientation than to maintain 
the figure’s orientation in the 
environment.