Close your eyes and try to imagine a red star. Alright, which of the 6 examples did you see in your head? Poll in tweet below 
pic.twitter.com/k8FadgsyrR
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Yeah I also can do this easily. But if you really piush me on the granularity of my mental "image" it's not that visual. I feel like we are missing axes on how to evaluate internal thinking.
I think this test is much larger than it seems. When I look at a tree I have a semantic-object for the tree. When I close my eyes and think tree, I've got only the object / concept. Asking what it's like in others heads gets v. weird