In this system there are three space dimensions and one time dimension, as in our universe. The gravitational field is constant within the area of interest.
Use the first slider to change the acceleration of the reference frames.
Use the second slider to move the time window.
Use the third slider to rotate the scene.
The plot on the right shows the full 4D spacetime. (The higher dimensions are present in the lower-dimensional plots but have zero length, which is why there's a "50m" label at the origin.)
Code, more details, feedback: https://github.com/timhutton/GravityIsNotAForce
More on these concepts: https://youtu.be/XRr1kaXKBsU