We have cut the mirror paper into 3 strips 3.4 cm wide by 9 cm. high. With adhesive tape,  we have jonied the sides to create a triangular prism (the brighter side of the mirror paper must be inward).  We have put the triangle inside the kitchen paper tube, towards one end. 

We have cut two transparent plastic discs 4.5 cm in diameter. And one baking paper disc. We have placed one transparent disc inside the tube, right on the triangular prism. We have put adhesive tape to lock it in place. 

We have placed the beads on the transparent disc, avoiding overfilling. We have placed the baking paper disc on top and secured it well with glue. 

At the other end of the kaleidoscope we have placed a 4.5 cm cardboard disc, with a hole in the center as a peephole, and other transparent disc glued to it.

Finally, we have decorated the kaleidoscope to our liking.