Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Noticing the Unnoticed

Our minds are constantly filtering and processing data so that you don't have to pay attention to everything. Your consciousness is only presented with the most relevant data that you need to make decisions. Small details are often ignored. For example, do you know which color is on the top of a traffic light? Or which direction Lincoln is facing on the penny?

Whenever you have a free moment, look around and try to notice something that you don't normally see. Study all the minute details about an object and recognize that it was made that way for a reason. What is that reason?

Sometimes art students are instructed to look at the world upside-down by bending over and looking between their legs. This different orientation often allows you to see things that you normally wouldn't see. Try it. You may also try getting really low to the ground and see what the world looks like from an ant's perspective.
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For more mind exercises: http://www.braingle.com/mind/