@NEETzsche @marine
Yes, what you said is something, I cannot argue about.
The game obviously expects only objects, that are moving to be entering the portals.
https://www.youtube.com/watch?v=vSnWree5wt4
And, while someone managed to re-write the game with their own phisics engine, you could easily (and correctly) claim, that it's a question of physics implementation then.
https://www.youtube.com/watch?v=ao1qVi5Qp3Y
So, all logic has to go back to hypotheticals :D