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Consider lines between an observer at (0, a, a) and points on the plane y = – z. As a gets larger, these lines get closer to being parallel and perpendicular to the plane. This means that the observer from that position will perceive points in space closer and closer to their perpendicular projections onto that plane (a, b, c) -> (a, b-c, c-b).

Similarly, for the observer at (0, -a, a) and the plane y = z, with the projection (a, b, c) -> (a, b+c, b+c).

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