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Interposition

Normally texture appears to be more dense in a distant object than in an identical but closer object. However, some depth cues will be stronger than others. This is the case when one object obscures part of another. We frequently obscure another indicator such as an average when multiple studies are used as an overlay in a chart. The partly obscured object will be viewed as farther away. However, your mind may again trick you, as illustrated in Figure 13.7. The farther object appears to be closer because the cutout gives us a pseudo-interposition. It looks as though the smaller card is in front of the larger when, in fact, the smaller is positioned behind the larger card with a cutout. Before moving away from Figure 13.7, can you tell if the card that is actually at the back is the same size in both illustrations? I suspect you will have to use your PRC—that is, your precision ratio compass or proportional divider—to prove that these two smaller cards are identical in size. I created the image on the left from the image on the right, so all four cards are in fact the same. However, adding the width of one pixel line to the inside boundary of the smaller card on the left will make it appear larger than its counterpart on the right. That is because shadows are also depth perception cues. When you draw a trend line on a chart, you can shift the proportional dimensions within it. They will be relative if the line is long enough across your chart. But short li....


  

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