When I get asked to give talks about interaction design I show Figure 3 from Kay and Goldberg's Personal Dynamic Media (1977) [1], with the "interim Dynabook" part of the caption redacted, and ask the students to fill in the blank. They usually guess "personal computer" and are then shocked to learn the actual framing and the overall backstory.

[1] http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.656...