Today I was tasked with capturing all of the new topiary at one of the hospitals I am responsible for photographing. It was a hot day and I took my time concentrating on getting nice shots despite the highness of the sun in the mid-morning sky. Forty-five minutes in, I spotted two birds twirling in slow lazy circles. They were using the air-conditioning smoke stacks as thermals, riding their ejected heat higher and higher into the sky. Within sixty seconds, they went from being fifty feet in the air to being almost out of sight. It was impressive.