It's a two-dimensional moving picture. Either drawn or cut-out or whatever is flat. Animation is the illusion of movement, giving life to what normally cannot move.
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2d
The answer depends on what is known about the 2d shapes.The answer depends on what is known about the 2d shapes.The answer depends on what is known about the 2d shapes.The answer depends on what is known about the 2d shapes.
A line (2D), ray (2D), vector (2D), line segment (2D), a mobius strip (3D), or a klein bottle (3D).
2d forms are flat shapes
The 2D equivalent of a sphere is a circle so it follows that the 2D equivalent of a hemisphere is a semicircle.