On: These are things in PHP which make me sad

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Can an artist make great art without knowing to use oil paint on canvas, instead of watercolor (or whatever - I'm not an artist)?

How about knowing the difference between types of brushes and what effect they have on the canvas? Is it 'great art' if it's accidental?

[ceejayoz → count]

Yes, and yes.

That said, this is more like arguing that you can't be a great artist if you don't know how to make the canvas yourself.