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The background (green in the image) is usually a darker shade than the knob. That’s how you can tell the moving thing apart from the depressed background even if you’re color blind.
Edit: Just realized that that wasn’t the point… Thanks, downvoters!
The background (green in the image) is usually a darker shade than the knob. That’s how you can tell the moving thing apart from the depressed background even if you’re color blind.Edit: Just realized that that wasn’t the point… Thanks, downvoters!