What do the lines in spherical rotation illustrations represent?
The lines represent the path that the in-waves and out-waves take as they arrive and leave the wave center (particle.) But at the same they also represent the shape of space. Space energy density at any location is proportional to the sum of the intensity of all the waves at that location. The intensity of a wave is the wave’s amplitude squared. Gradients in space energy density are followed by waves as the waves move through space – and partcles are made of waves. So particles move according to space energy density gradients (e.g. cause of gravity.) In effect the energy density gradients define the shape of space since it’s these gradients that particles follow. So back to the question… The moving, twisting waves within the particle center are shaping the space energy density/shape of space. Saying that the lines represent the path of the waves is also saying that the shape of space is twisting and untwisting.