Algodoo objects (circles, boxes, polygons) are essentially containers for variables. When you draw a box, the engine assigns it default properties (friction, restitution, density, color, velocity).
For advanced users, (persistent across all scenes) can be created by editing the config.cfg file (located in %APPDATA%/Algodoo on Windows). Here you can define global functions, hotkeys, and default object behaviors. algodoo mods work
For deeper learning, you can refer to the Algodoo Thyme Scripting Guide for a full list of commands and variables. Algodoo objects (circles