Summary: Answer the question to the right, and see how other turkers and blog readers answered similar questions. After you answer the question, the red dots will show where people answered "yes".
This is just for fun. Stuff like this has been done before. For instance, this CrowdFlower post shows what names people give to different colors.
I had originally wanted to ask if the dot was "above" the bar, but I feared the result might look to boring, like a rectangle.
I only use one API call to MTurk, and that is to create the HIT. I don't get results, and I don't approve people. I don't get results because they have already been submitted to my server, and I don't approve people because they will automatically be approved after one hour -- this is a parameter when creating the HIT. But Greg, doesn't that mean people can cheat? Well, yes, but I find that people typically don't cheat on questions like this, because they're simple and kindof fun. Also, I wouldn't know if they did cheat. Each person is only allowed to answer the question once, so I can't even see if their results are statistically improbable.