Instruct: Classify the given Amazon review as either positive or negative.
Query: sad

Well, yes, it looks good on display sitting on your shelf. But as for creating a striking prism rainbow i remember creating in 5th grade (decades ago) with a real crystal prism - it simply does not deliver at all. A standard household flashlight with new batteries should be enough to do the job but it doesnt. You can barely see colors on the outside fringes of the beam and you will need to hunt for them by rotating the prism. :(