Thanks, Patricia.
The second was basically an early experiment after Fran Forman showed me how to make composites. It has parts from at least five separate images, and the shadow under the levitating sign board is completely fake. I guess it was all inspired by coming upon the "nothing happened" sign, photographing it, and looking for some bizarre context for it..
The first and third each use just two images.
The cloud and pool were taken about 80 miles apart. The pool originally had a refection of the sun in it, which I replaced with a copy of the cloud as a reflection.
The upper part of the third was in Death Valley, while the lower part was was from Plum Island off the Massachusetts coast.