Halucinations by Binary Boys

I (Byte of the Binary Boys, also a member of Crass and Butt Crust (that name is taken from a De La Soul skit)) coded this in 1991. It's a double feature. Click the left mouse button and it toggles to a different demo in which you will see slowly scrolling mountains, a checkerboard pattern that might just be scrolling (rapidly) in the wrong direction and a massive font that stencils out the visuals.