Prototype Apple II systems and peripherals. Every idea starts somewhere, and in the process of creating that first one, things change, become obvious, or become obviously fruitless.
Imitation is the Sincerest form of Engineering - Why think, when you can Clone! (and cash in, too!) Usually it collapses under legal pressure, but sometimes it works..
Apple II & Related Manuals, Books, Software Packages, and such. Like a window shopping trip back in time. Egghead Software, ComputerLand, the Byte Shop, and other computer store shelves might have looked like this.