How to Make a Kaleidoscope?

The principles demonstrated in this project include the principle of multiple reflections and reflection of light. In this case several mirrors are put together, and as the viewer gazes into one end, light entering the other reflects off the mirrors. This then creates an appealing and colorful pattern.
A kaleidoscope is, at its heart, a symmetry machine. Every kaleidoscope, from the simplest to the most complex, uses a prism of mirrors to generate symmetric patterns of light and color from asymmetric objects. It is made of two or more mirrors or reflective surfaces positioned at an angle to each other, usually forming a V-shape or a triangle.

[vanessavan]

Can you show how to do it but more slowly