In the previous two videos (links below) we talked about how to use shape keys and instances to explore different versions of our models. Video about Instances: https://www.youtube.com/watch?v=7gQMf9Vic1w Video about Shape Keys: https://www.youtube.com/watch?v=46Io339xuv0 Quick tips playlist: https://www.youtube.com/playlist?list=PLZWSnMW9jKAHHcX-U-K8nR9mvlwo4POwD Website link: http://blendtuts.com/tutorials-list/qt009-2