Denys Fisher, the creator of Spirograph, sold his company, bought an estate in Scotland and started working on his next creations, or at least so is narrated in a BBC's documentary, broadcast as part of "Tomorrow's World" in May 1977. I know because a clip of the documentary was posted on YouTube by the BBC Archive channel...
In the clip, we see Mr. Fisher using a sort of personal computer, that smells HP but I really don't know (in that years they made amazing stuff in UK!).
Also, just a bit later, we see a pen plotter drawing a jagged rendition of a complex pattern.
Do you know what computer, what pen plotter is he using?
