This is a model we use in my SketchUp classes to practice the basic navigation commands. More information about learning how to use SketchUp, and information on classes I teach is available from my website. After you download the model, spend some time exploring each individual object. They are similar, but each has unique characteristics so make sure to look behind and above and below them. If you discover something you didn't notice at first glance, zoom in for a good look.