Above is a terrific piece of concept art by Tony Baxter for the original idea for the Land pavilion at Epcot. It's not what was finally built, but you can sure see the inspiration for the Imagination building in it. (And Tony needs his own site, don't you think?)
I've compiled a list below of some Imagineers' websites, those both past and present. And one of a man who should be: Eric Scales. Click on each one, and you'll be delighted by the discoveries awaiting you. It will whet your appetite for what the guys and gals have planned for Shanghai Disneyland!