Classroom: Circles on the Machine

Introduction
Tools for creating circles
Knitting Techniques
Inspiration
Course: Knitting in Circles

Swirl Top Beanie

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Constructed with decreases, the crown of this Swirl Top Beanie is a circle.
Why not knit a short-row circle, then knit a rectangle for the body of the hat and attach it to the circumference of the circle?
Similarly, use a circle for the top of a tam or beret