For the person who asked about what's a tube... PSP has a tool called the "Picture Tube". PSP users can open any image in PSP, select the part they want, place it on a transparent background (NOT A GIF) and then export it so it becomes a tube (a PSP native image format with the extension tub). Then the user can select the tube tool and start creating images with the various clipped images they have in their tubes collection. Think of them like stickers. Used with layers, the user can create almost 3d like images. I hope this answers your question.