How do you know a starter has started?

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cyclonebeer

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I've got some questionable yeast in a starter on my stir plate. I'm using a mason jar with foil cover (no airlock). What tell tale signs can I look for (short of taking a hydrometer reading) that will tell me that the yeast is viable? Foam? Krausen ring? Smell?
 
After a day or two you should have a light colored layer at the bottom of the jar. This would indicate a yeast colony. Also, if you swirl the solution there should be some co2 released and some foam.
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