Here is a fascinating talk where he describes the approach for designing Apple's Lisa: https://web.archive.org/web/20040511051426/https://computerhistory.org/e

Here is a fascinating talk where he describes the approach for designing Apple's Lisa: https://web.archive.org/web/20040511051426/https://computerhistory.org/events/lectures/appleint_10281997/appleint_xscript.shtml https://web.archive.org/web/20040511051426/https://computerh... Fascinating because that exploratory process is essentially what we recognize as "graphical user interface" as of today, and the whole industry has committed itself to that particular design, to the point that exploring how to build interfaces from any other set of principles feels like a titanic task.