Shadows of shadows

I was just playing around with the shadow tool.
I took a black square - no line - and added a shadow 10px over, 10px down, 0% transparency, and kept the 6px blur. Then I converted to editable shape and ungrouped and moved the shadow over. Then I made a shadow of that shadow, and kept going.
What's interesting is that while the visible shapes themselves seemed to stay the same size, the actual shape and the space it occupied grew - as evidenced by the outlines.
Weird?
Can we learn something useful from this?

Quote:

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Originally Posted by -=Drifter=-

I was just playing around with the shadow tool.
I took a black square - no line - and added a shadow 10px over, 10px down, 0% transparency, and kept the 6px blur. Then I converted to editable shape and ungrouped and moved the shadow over. Then I made a shadow of that shadow, and kept going.
What's interesting is that while the visible shapes themselves seemed to stay the same size, the actual shape and the space it occupied grew - as evidenced by the outlines.
Weird?
Can we learn something useful from this?

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Only that a shadowed object takes up more space than the object itself?

Hmmm ... if someone says you are only a shadow of your former self you can now prove, that if this is so, you have actually grown in stature ;)

Actually in the real world, shadow of shadows happen all the time because there is often more than one source of light. It is called a "pent umbra" I believe.