If the proper processes are used, wood can be curved and remain in its desired shape. For this, there are several known techniques.

This study revealed how the changed ER structures at both convex and concave surfaces helped lower the strain energy experienced by the cell during protrusion and contraction.

The convex (outgoing) curves scatter light, and make their areas of the reflection darker. The concave ones focus light and make their areas of the reflection lighter.

Workplace furniture brand Sihoo has created an ergonomically-sound office chair made up of convex and concave curves that "closely mimics the human form".

The best legs also have a short concave curve which descends into the ankle, and a much longer and smoother convex curve on the outside – and the curves on the inside and the outside of the legs ...