Inspiration, mantra or decor These Asana Air are reproductions of the main yoga asana forms. They are made entirely by hand with a 3D pen. What is a 3D pen? It is a real pen which is used tocreate three-dimensional works.This technique allows you to create everything your mind can imagine, without spacial limits. You can create figures on any axis you want. The Difficulty? Time! You only have a few moments to make your creation before the filament returns solid.