In a previous post, I embedded a video of a particle animation generated by a few generated wave forms, and a morphing rectangle. The particle would react everytime it came in contact with the rectangle. At the time of making the post I could not disclose how the collision detection was done, and it could have easily been done using the standard logic actors that have been available in Isadora for years, but it was not; it was created using the new Javascript actor.

Using only native Isadora shape elements, freeframe fxs and logic (more on this later HERE)..
This video uses real-time collision detection to control a number of display attributes.
You can see both the Orb change in color and size when the collision between it and the floating Rect is true, as well as; the Rect it self changes.