Envelopes provide a powerful and simple way to shape objects. When you apply an envelope to an object, the envelope surrounds the object and appears as a dotted red line with a series of squares at points along its path. By dragging the nodes in any direction, you shape the envelope. In turn, as the envelope changes shape, the associated object automatically reshapes to conform to the envelope.
Additionally, you can continue to shape an envelope and the object it surrounds by editing the envelope. For example, you can change an envelope's line segments from lines to curves.
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