ART.................?

answers1: Op Art is also known as optical art.
answers2: Sorry, but you should not be asking us to do your homework
for you. We can help you find the answers, but you should write it
yourself. <br>
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Perspective is when the lines in the drawing all have vanishing
points. One point has one vanishing point in the image, whereas
two-point has two. A multiple point perspective is very complicated,
and generally allows the item in space to appear more real. <br>
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Op art? Like Optical Illusions? That usually implements colors to
allow different parts to pop out, color contrast may allow some colors
to appear further back to your mind, even though you consciously know
they are all on the same plane.