>>55074896>>55069032And this post
>>55071559The turtle thing is a saying for infinite regress, refering to the idea of the world turtle sustaining the world but being atop another turtle which is also atop another turtle which is also... you get what I mean
In the Indigo Disk postgame you and Sada and Turo from another world are misplaced into a different space-time where you give them upgraded Heath's notes from Briar that help them develop the time machine, something the professor of your world should have experienced at one point too. The idea is that the professor of that world gets help from us, but our professor got it from another version of us, who knew about their own professor who got help from yet another us and... the same thing as the turtle.
Also explains Heath's note in that "dream" he had in Area Zero, it had his handwritting because it was his handwritting, it was passed to him by another version of himself who probably got it from another version of himself and that goes to infinity. Terapagos /Terastal is the responsible for these misplacements in the timeline.