The first one can be seen either way. For me, I saw a vase first. In all of the pictures, the black drawing is considered the positive space and the white background behind it is considered to be the negative space. If you look at the vase picture again and imagine the background to be the black portion, you see two faces.
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A posed shot is exactly what it sounds like. It is when you have your model or models pose for a picture. A candid photograph is a much better choice.
Your answer would be Voice disorders
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Well it depends on how well you take care of it, they don't really have a certin amount of times that you can use it un'till you have to get rid of it
1: The sides will be the same when cut in half, but the closest number that could be guessed is 3in
2: Wont matter much, they’re both the same
3: My speculation is that the Black square in 4x6. In order to know the size of a white square we have to do the following
4 + 4 = 8 left vertical side
6 + 6 = 12 upper horizontal side
So we have an answer: The white square is 8x12