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Gee, some of us have made the nature and behavior of what one gets from a
pin hole an important feature in materials we use with students for some
time now. We do not tell them that pinholes do not form images (contrary
to what Leigh seems to be implying). Instead we invite the students to
carefully compare properties of real images from lenses and the patterns of
light one gets from pin holes and then we invite the students to decide
whether these are the same entities. For some of use teaching is not
telling.