I personally have difficulty visualizing things. For example, if I imagine a cylinder and try to rotate it in my mind, I cannot get it to stop. In fact, the harder I think about stopping it, the faster it rotates.

Cultivate: "And just as a note, I have great trouble in controlling my visual imagery as well; it always seems to be mocking me. If i try to imagine shooting a basketball into a hoop it invariably hits the rim and i have to fight to get it to go in the hoop. I think this is something you can overcome, however, when you begin to pay more attention to it. Good luck!"