Big picture

• This edge is straight!

• This edge has curves, but no corners.

• This edge has corners, but no curves.

• This edge has both curves and some corners.

Curves

• This edge curves, but gently.

• This edge has a combination of tight and loose curves

• How to handle the tight curves

Corners

• This edge has some slight corners
• This edge has a few corners, some of which are sharp.