"Look
at this!" says Carmine. "This is a perspectograph.
Leonardo and other Renaissance artists
used it to explore linear perspective.
"Linear perspective was probably the greatest artistic innovation of the Renaissance. For the first time, artists could create realistic three-dimensional spaces on a flat surface. Let's see how it works!"
"We can use the perspectograph to trace the perspective lines of the view out our window," Carmine says. "Hold
the perspectograph up to the window (see below). Now look
through that little slot in the wood."
"Take a look at these sketches," says Carmine. "In one of them, the perspective doesn't look quite right. Can you click on it?"
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