In figure 3, there are two poles on a small hill.
Downloadable file: shadows.png
Notice how the shadows diverge, similar in manner to pictures found on a web site Ian Goddard maintains, which will be discussed in § 3.
From the air, figure 4
Downloadable file: shadowsair.png
shows the same poles but from a view higher up.
A movie showing movement from the view in figure 3 to figure 4 is downloadable at shadowsm.mpg.