1. That they function on 3 levels; autobiography, geography and metaphor. For autobiography he means that for the photographer this is where he/she put their view and this is how the photographer wants to view the place or whatever he is shooting meaning that this is where their experience shows of that place. For geography he means this is where the place is at that is being recorded. It is just a record of a certain place that already exists. for metaphor he means this is where the viewer chooses what they want to view the picture as. Their own interpretation of the picture that is already taken.
2. It is important because they would not cause fires. It could "umbrella" the lights meaning the light could be stopped from giving too much light or it could reflect the light so it bounces off it back to the subject. This let's the photographer have more control of the lighting situations.
3. It is so you get the lighting that you as the photographer wants. Not diffusing the lights or flash could become a problem as it could over expose your pictures or simply not give you want you wanted.
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