The greatest controversy of the drawings though was the subjects and
activities that they illustrated. They seemed to document a process or a
ceremony. The hill was shown in profile and people were shown engaged in an
activity at the bottom of the hill, climbing the hill, and engaged in
activity at the top of the hill. At the bottom of the hill they were shown
assembling strangely shaped structures which they are then shown as carrying
on their backs to the peak. The remarkable thing is that the structures
closely resembled the Rogallo hang gliders of today. Even more remarkable
is the fact that the figures are shown as running down the hill and soaring
into the air apparently to glide back down to the base of the hill. If the
drawings are authentic it means that they flew five hundred years before
Otto Lillienthal or the Wright Brothers.Perhaps now you can understand why
Professor Vogelhund was such a controversial character. He is claiming that
man flew in the fifteenth century using hang gliders made of primitive
materials but with very sophisticated design.