It was inspired by Cedar.

Wirth took sabbatical years to work at Xerox PARC in the two occasions.

After the first visit when we learned about Mesa, we designed Modula-2 and its OS Lillith.

On the second visit he got to use Mesa evolution, Cedar, which was his inspiration for Oberon and the Ceres workstation.

Replying to my own post. As it is already frozen for editing.

Please note the sentence

> After the first visit when we learned about Mesa, we designed Modula-2 and its OS Lillith.

we is wrong! Stupid mobile autocorrection, it should be read he.

Wow, that's fascinating.

Oberon dates from the 80s, so much earlier. But they are clearly kindred spirits in wanting to make whole systems that a single person can understand.