In recent years his interpolated rotoscoping technique--for which he wrote the software--has made waves in films like Richard Linklater’s “Waking Life”, "A Scanner Darkly", and Lars von Trier’s “The Five Obstructions.” Since 1997 he and his company Flat Black Films have created a string of rotoscoped short films which have helped popularize animation as a medium for documentaries, These include “Grasshopper”, “Snack and Drink”, “Roadhead”, and "The Even More Fun Trip". Bob's work stands out by bringing a painterly, hand-done approach to the traditionally mechanized and sterile world of computer graphics.