Unususeful. after a time is something you used for a certain act replaced by something new and more useful.
First there was the finger. After the finger came the Quill. After the Quill came the pencil. After the pencil came the typewriter. After the now typewriter came the Personal computer. After the Personal computer came the touchscreen.
Because of all this evolution, the most of the time you forgot what there was before. The guys from Jung Von Matt created a new Museum. In this museum you can relive history and enjoy those old products in the Museum of Obsolete Objects.
In the museum at youtube you can watch short films you can see the demonstration of the obsolete objects.
So what’s going to be obsolete in the future?