Movement (Motion): A change of position that does not entail a change of location
"Catwalk at Park Guell" Gaudi, Barcelona, Spain
Threshold: The place or point of beginning; the outset
The idea behind the collage showing threshold is the idea that from any point you can go in any direction. The top image shows the point at which your direction begins while the bottom image is a collage representing the mix of the possible directions you choose to go.