eSource Optics Axicon Rainbowindows state-of-the-art Holographic Prism starts with laser technology and ends with pure spectral color. 4” Diameter, laminated glass prism mounted in a silver finished chrome frame. Comes with a vinyl rubber suction cup for easy hanging. Hanging from a window in DIRECT SUNLIGHT, eSource Optics Rainbowindow will transform the sunlight light into an explosion of multiple hues. Pinwheels of vibrant color will fan your room...splashing walls, ceilings and floors. Forty-eight spokes of red, orange, yellow, green, blue, indigo, violet... and every shade in-between... will dance about the room, awash in a glorious spectrum of rainbow color. The effect is absolutely spectacular!