@robin I think Alan Kay would probably concur that the Dynabook he envisioned in the 1960s, still does not exist.

e.g. http://billkerr2.blogspot.com/2008/12/alan-kay-after-40-years-dynabook-is-not.html

We are getting closer, perhaps.

Having been to DynamicLand in Oakland, I think most people do not even realize how much of a visionary Alan Kay actually is.
Too many in tech are too fixated on monetization, not elucidation.