abstract, and vice versa, art, background, ball, balls, balls newtons, black background, blue, book, branch, christmas, christmas tree, christmas-tree, circle, communications, conversion, crystal, decoration, demonstration, different, energy, fire, flicker, flowers, fractal, fractals, garland, glow, gnome, highlight, holiday, holidays, images, kinetic, light, lights, line, magic, mechanical system, mood, new year, pattern, pendulum, planet, potential, red, snowflakes, space, sparks, species, sphere, star, tinsel, toys, wallpaper, wallpaper., window