Understanding GestureExamples

Hi, I was going through the GestureExamples scene in unity meta XR interaction SDK samples and I can't understand where the SwipeGestureLeft/Right are being used to change the stone colour and the image.

I can see that there is a change color script on the stone but where is it taking the swipegesture active state? And how is the Image being changed in the picture frame? I can't see the gestures being used anywhere.

I'm a complete beginner, so any help would we appreciated.