GR translation: crossover point

[alice wellintown]

The cross over point, is generally the point at which something is not
reversible. That is the phrase that seems most important here: Not
Reversible. What does it mean? I think it means Western Man's way of
thinking about the world. And, GR seems to challenge this idea. So,
maybe it is reversible and therefore there is no crossover point?

http://www.themodernword.com/pynchon/pynchon_essays_sloth.html

Try de Chardin.