Then I found a gallery of photographs at Gadling, a look at some of the best airport architecture around. One picture caught my eye - the original for that image on Dopplr.
No wonder it was familiar, it was the recently remodelled concourse at Seattle-Tacoma. The original picture shows the wonderful spiralling sculpture that fills the void behind the coffee bar. The sculpture is rather amazing: a mobile composed of small plastic toys, it's a 3D image of a bald eagle reaching for a salmon, and its reflection. The rippled reflection is made out of fish, the bird of soaring gulls. Suddenly you realise that some of the outlying components aren't fish or birds - instead they're random plastic toys.
The photo is marypcb's - from her excellent Airport Art group on Flickr. It's a small community, but growing, now with nearly 100 members and over 300 shared images.
And if anyone wants a Dopplr invite, drop me a line...