Love this animation from Barcelona-based motion designer Marc Urtasun that gives new meaning to the term "rolling alphabet." He animates the letters so that each is activated by turning a key to get them moving. When asked in an interview by Premium Beat how he makes his animation seamless, he states:
This depends a lot on the objects you are working with. You have to look at the shapes and similarities between objects. If you work with 3D I think it is much more difficult because the process becomes of the higher amount of detail. The kind of effect I incorporated is usually used with 2D or flat style, but the result when done in 3d is awesome. It was sometimes much easier than it seems because you can “cheat” the eyesight. Everything happens in only few seconds so the most important thing is that the design looks fluid. This method isn’t always the same so you have to adapt it to the object.