An amazing demonstration to teach reflection, waves and frequencies. Reflecting a laser beam off of two spinning mirrors creates an incredible laser light show of beautiful patterns commonly known as Lissajous figures. This demonstration is a real student attention grabber-it is hard to imagine something so beautiful could be created from such a simple demonstration apparatus! Using the unique laser light show board, two versatile Bracken demonstration spinners, and a laser will allow you to easily create your own laser images. Complete with detailed teacher instructions and comprehensive background information. Two Bracken demonstration spinners and a laser are required and sold separately. A green, high-intensity laser can be used to produce extra clear, crisp laser images.