iMacs of the future could be made entirely of a single sheet of curved glass, if a recent Apple patent is anything to go by. According to the patent, the iMac could have a radical design overhaul with a foldable glass keyboard deck, dual trackpads, and more. The patent also shows a possible design of Mac accessories that allow for a MacBook to dock directly into the glass surface to allow for a larger working area.
https://www.notebookcheck.net/Future-iMacs-could-be-made-entirely-of-glass-and-resemble-a-glorified-MacBook.451346.0.html