Well technically Bryce, Poser, Vue, etc. are programs, not seperate media. Renders made with them are the same medium: 3D/raytraced. Mixed media would be like 2D cartoonism mixed with a 3D background. 3D model from one program rendered on 3D background from another program is still 3D. Medium refers to the materials used in the creation of a work. All raytracing software, be it Bryce, Vue, Poser, Blender, POV-Ray, or whatever, are the same media. Took art in high school, the course mostly consisted of the "rules" ^^ Oh, more on topic: Most of the renders in my gallery use Poser stuff, but only one is actually in the Poser gallery - one done entirely in P5 ^^ Everything else with Poser stuff is in the Bryce gallery, because that's what they were rendered in.