Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Really strong but only shows 6 colors

I got this prism about a year ago for a project in school about Isaac Newton. This helped me demonstrate light. It now sits on the windowsill and every day for a few hours, there is a really strong rainbow. Unfortunately, it only shows 6 colors. If you look through one side it looks like the world is rounding out in front of you but you will probably end up walking into a wall or some furniture.