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\begin{document}
\title{Prova}
\author{JB}
\date{November~2007}
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\chapter{Introduction}
\dictum[Harvie Krumpet]{Fakt 48: Fakts still exist even if they are ignored.}
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Light is all around us and it's one of the principal means by which we perceive the world. Already Euclid realized that light in free space propagates in straight lines\footnote{He believed that \textit{visual rays} were actually coming out from our eyes to probe the world around us and not coming in from an outside source, but this does not spoil the validity of his intuition.} but the light that we see seldom has made a straight path from its source to our eyes.
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