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The Screen
It's not just any screen that works with Geowall. The screen must preserve polarized light. In general, older silver screens work, as well as some screens that have a special coating on them. We paid $190 for our 60" x 60" screen, and bought the screen from ProjectorPoint.com. There are a number of screen options for Geowall. Our decision was based on the fact that we wanted Geowall to be portable. In a larger room where Geowall is meant to be a permanent fixture, the best option for good output is a rear-projection screen. This can be done either by having the projectors behind the screen projecting directly onto it, or if less space is available, a mirror can be used to reflect the image to the screen. This option is the most costly, and often requires architectural modifications to a room. A permanent front projection system can also be devised using a larger screen attached to a wall. For the trip-pod screens, like the one we bought, there were two sized available: 60" x 60" and 90" x 90". We have found that the smaller of the two is large enough for most of the rooms that we have used it in and is easily visible by up to 30 or so people. If you are looking to make Geowall portable, this screen is the best option for your money. We inquired about having wheels added to the screen and were told that this wasn't an option. In retrospect, the screen doesn't need wheels, as it is light-weight and easy to move. Be sure to keep your eyes on dumpsters. Silver-screens that can preserve light polarization, are often thrown away because they don't reflect light as efficiently as their white screen successors. In fact, a silver screen reflects too much light, picking up ambient light from the room and thus reducing the sharpness of the image. If using a silver screen, It is best to put your Geowall in a room where you have control over outside light sources. Originally, we wanted to mount the screen to the cart with some sort of harness. However, we found an easier solution. Using one of the posts in the AnthroCart from which we removed the rubber end-piece, we simply latched the handle of the folded-projector onto the side of the cart. This made it necessary to pass through doors with a certain orientation, the solution has proven to be very effective.
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