A mixing baffle for mixing a fluid flow in a static mixer includes a mixing element support structure extending along a longitudinal direction and a first set of moveable mixing elements coupled to the mixing element support structure. The video source material includes modulated entities for providing artifacts incompatible with the content of the video source material and selectively deliverable information that the projection system uses to demodulate the entities. The end dividers can also include extensions or shrouds for receiving and protecting the ends of the reel, as well as sockets at their tips for releasably attaching various types of harvesting fixtures.