According to Wikipedia, a teleidoscope () is a kind of kaleidoscope, which have a lens and an open view, so they can be used to form kaleidoscopic patterns from objects outside the instrument, rather than from items installed as part of it. It was invented by John Lyon Burnside III.
This is how you see with the teleidoscope:
This is the finished teleidoscope. You can see the lens here, a simple transparent glass ball.