PoseBook 3D by Silver is a free iPhone application designed to provide artists with a self-controlled tool for practicing the construction and rotation of heads. With this app, artists can gain a better understanding of how forms move in space and learn to draw heads from multiple angles.

One of the standout features of PoseBook 3D is its lighting control, which makes it an excellent reference tool for painters wanting to understand shadows. The app offers a variety of character heads created by different artists with unique styles, making it a versatile resource for artists of all levels.

Developed with inspiration from renowned artists Andrew Loomis and George Bridgman, PoseBook 3D allows users to fully rotate the forms and offers guidance on construction, tilts, and perspective. Its portability makes it convenient for artists to practice on the go, and its continuous use can help in developing a better understanding of form and character creation.