Are both objects selected in Physics Collision condition?

How do I...?
1

I have a simple question:
image
Which of these is being selected to be used in the events?

Edit:
Also, what about normal collision check?

2

This is easy to test. Add a collision condition and then add an action like to rotate the objects or change the color or enable an effect. I like to rotate the objects because otherwise you need to disable the effect or change the color before the collision.

Collision between OBJs
… Rotate objects

Or

(no conditions)
Disable object outline effect

Collision between OBJs
… Enable object outline effect

You could add the drabbable behavior to the objects to position them. There’s a dragable behavior for physics as well. You could add a floor object to keep the physics objects on the screen.