These are awesome. Using Adobe Flash, the creator Gwen Vanhee has built a rendering/drawing system - a custom-coded brush in ActionScript3 from scratch to draw the imagery. He has a particle system which responds to movement, speed, rotation, mouse gestures and audio frequencies attached to the mouse. So while 'handdrawing' the general sense, direction and rotation with the mouse, all data is recorded to be rendered (frame by frame) afterwards. In short, the resulting imagery is code reaction to mouse gestures. Brilliant, isn't it ?
Go to revoid.be/geometric @flickr for more work in this series. See the largest version for the astonishing details.