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> Where is the red circle drawn? How large is it? What shade of red? How are those arbitrary values chosen, and how do I choose others?

http://www.wolframalpha.com/input/?i=draw+a+red+circle

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I was expecting it to be filled with red, not just have a very thin red border.

You're thinking of a disk: http://www.wolframalpha.com/input/?i=draw+a+red+disk

That is a good example of how people are not precise enough with their natural language to be computationally useful.

http://www.wolframalpha.com/input/?i=draw+a+red+filled+circl...

It's still a bit iffy.

http://www.wolframalpha.com/input/?i=draw+a+green+filled+red...

And yet, "draw a red enso"* just gives me a circle.

* http://images.google.com/images?q=enso

(The results for "bring me some delicious pho" are similarly unsatisfactory - it just tells me that delicious means "greatly pleasing or entertaining". Not news to me, pal!)

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