What about blue lasers?

Blue lasers are built with the same concept as green lasers, but with more complex conversions and crystals. Subsequently they are a lot more expensive than red and green lasers (yellow/orange and other colors are even more expensive because they have even more complex building processes). What else can I do with a laser besides burning stuff? Here are some great examples of other cool tricks you can do with lasers besides just burning stuff: Spirograph Scanner Liquid Sky Time Tunnel And this is just the beginning of what lasers can do!