Imagine you are flying over Boulder. The land is scattered with small bodies of water and Boulder Creek winds through town, looking like a icy black runway. As a large bird that has been migrating all day, you think one of these places might be a great spot to fish and rest. You begin to descend onto the ice but right as you are about to dip your webbed toes into the chilly slush, you realize this is not water at all. Your feet come to a halt…