A journey is made up of different legs: just like giving directions.
Physics is simpler but more exact. Each leg is a straight line: set the direction and distance using the pucks.
Every journey is a collection of legs. To get curves, put in many short legs, with a small turn between each. If you’re not sure how this works, imagine walking along a curved pavement, step by step. Each step is straight, but you walk along a curve because you change direction a little each step.
See a journey from different points of view – remember it’s the same journey. Changing where you choose to see the journey from doesn’t change the journey.
Each point of view is a choice – you can’t choose not to have a point of view. Eventually, you’ll need ways to find out how a friend, who has chosen a different point of view records the journey. For now, you can switch to a different point of view in the diagram, and see how they record the journey.