Spiral Bound 2026 Calendar Assessment Overview. A shape made up of curves, each one above or wider than the one before: [1][2][3][4] it is a subtype of whorled patterns, a broad group that.

A shape made up of curves, each one above or wider than the one before: A spiral is a shape which winds round and round, with each curve above or outside the previous one. The spiral shown below is a type of spiral referred to as a helix, and has a parametric equation of the form x (t) =.