Forge of Neon is like creating on a lathe. The higher the symmetry number you use, the more it is like creating a fully solid 3D object, since the lines will be drawn closer together. If you only use 2 sides, it mirrors what you draw. You can also opt not to use any symmetry. But the higher the symmetry, the cooler it is IMHO. You have a choice of 2, 4, 8, 16, or 32 symmetry. If you use the in-app upgrade (only $2 and well worth it), you get 64 symmetry, no ads and the ability to save your image to the gallery.
You can rotate your object with your fingers and continue to draw on it. You have a choice of 8 different “brushes:” a solid circle with blurred edges, a straight line, a star, a flower, a heart, an outlined circle, a circle with 5 concentric rings, and a 12-sided pinwheel.
You have a a full hue spectrum working with additive color, so remember the more colors and strokes you use in an area, the lighter that area will become.
Tipped on its side, your creation may look like some kind of lamp or glowing undersea creature. Turned completely perpendicular, it will probably resemble a kaleidoscope or mandala. Enlarged, you will see the the detailed shapes of the brushes. If you turn on Animation, it pulsates and throbs light.
I highly recommend this app and its upgrade.