A book is born in strange circumstances. This one began in a museum on a
rainy Sunday afternoon when my younger son said that the bodies in a Giotto
painting looked like the artist did not know how to draw. He was young then,
but old enough to have been educated into the cultural medium of central
perspective vision. That innocent comment started me wondering about the
ways in which we see and take for granted our visions. It started a journey which
has taken six years to complete. Along the way I have gathered many debts and
I have made many new friends. I want to express my gratitude to all of them.