Revision clouds are polylines that consist of sequential arcs. They are used to call attention to parts of a drawing during the review stage.
A revision cloud is a polyline of sequential arcs to form a cloud-shaped object. If you review or redline drawings, you can increase your productivity by using the revision cloud feature to highlight your markups.
You can create a revision cloud from scratch, or you can convert objects, such as a circle, ellipse, polyline, or spline, to a revision cloud. A style is available to make the cloud look as though it was drawn with a calligraphy pen.