Space forms are mostly geometrical forms or flow forms which you can find in the water movement. In nature for example you can find a five pointed star in an apple core. In the snow flakes a star with 6 points or the hexagon in the beehive. Nature offers us a lot of geometric laws in plants, stones and water.
We as human beings are able to make these geometric forms visible through movement in a group. For example 5 people are creating a five pointed star. When everybody is moving to the next place of the star at the same time, it is like they are drawing it into the space.
Then there are triangles, circles, figure 8, flow forms and many other forms which can made visible through conscious movement of a group of people.