Algodoo

That's really cool!
This has some potential (maybe another portal game?).

Nice scene. Works well and good coding example.

Could be improved slightly if the teleported position is the same relative position to the triangle as the start position.

Maybe like this:

If py = yellow triangle position, pr = red triangle position, p0 = item initial position, p1 = item transported position then

p1 = [p0(0) + pr(0) - py(0), p0(1) + pr(1) - py(1)]

Cool

Why you use Scene.my!

my demo is overdue! sucks!