I found an old DOS screensaver that is truly mesmerizing: TUNNEL.ZIP. It's a neverending rainbow tunnel of psychedelic color, with concentric rings of light that become smaller and smaller until they reach the center of the screen. It's very simple and yet it has a very powerful effect. I haven't seen anything, anywhere, that could put me in a near-hypnotic trance so effectively. Another trippy screensaver is ACIDWARP.ZIP All of the screensavers that I tested work just fine with DOSBox too.