Luono is a webapp that enables you to draw using only you trackpad/mouse. Create a new "boat" or artpiece by pressing any button while in the homescreen. Share your boat by pointing to the left with your cursor and press the share button. Change the color of the pointer by pressing the "c" key on your keyboard, and the ctrl to lift the pointer (so it stops drawing). You can see these shortcuts by pointing your mouse to the right.
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