A repulsor ray uses an electromagnetic field generator to focus ionized particles into a central sphere of heat and energy. Which with a sudden reverse of current can be shot out in energy ball type form. (As used in Iron Man)
The 2 types of shapes are the geometric shapes and the organic shapes. Geometric shapes are ones that can be described using mathematical formulas. They also have specific math names. Geometric shapes: Circle, Square, Rectangle, Triangle, etc. Organic shapes are irregular and uneven.