My first computer was an Amstrad PCW9512 - primarily a word-processor as the initials suggest, and complete with a daisy-wheel printer.
It was accompanied with a range of auxiliaries including compilers for a version of BASIC, and a very strange language called D[igital] R[esearch] LOGO.
DR LOGO was allegedly designed to help school-children learn something called "structured programming", a phrase akin to advertising a house as "architect-designed", so not necessarily meaning good design for purpose. Ignoring the childish name "turtle" for the arrow-shaped cursor, LOGO could be made to do real work, but the command names were so abbreviated and non-intuitive that it was very hard to understand even the sample programmes printed in a tutorial text-book I bought.
One such would draw a short, straight line then abruptly turn 90º, draw a second line, turn again... The right-left choice was random, apparently set by the immediate 1 or 0 value of an arcane bit within the operating-system.
Like that "Hello", this thing would happily fill the screen until you found some way to stop it.
Some years later I saw a much fancier version likely working in the same way: that screen-saver called "Pipes".
Screen-savers..... another memory, from cathode-ray tube monitors.
