How was it I did not see that lofty sky before?

Peering through the corkscrew willow, one can hardly tell that this is a fisheye, since the branches are entirely independent of the distortion a fisheye brings into a photo. (On the left you can catch a glimpse of a red maple.)

Photography note: The photo was taken with a Pentax LX and the SMC 17mm fisheye. The Pentax 17mm is a rectilinear fisheye, which helps.