I see, thank you!
I’ll try again to describe what I would like to do: I would like to start a stimulus (polygon) under the condition that a valid mouse click has taken place before at this position. (I want the participant’s choice to be marked with a transparent ractangle for a few seconds)
I could create a shape component in the builder and let it start under a condition e.g. mouse.getPressedIn(three) (three is a clickable stimuli), but I think this is not a legal condition… Maybe there is another possibility to integrate this condition?