These stunning glass pipes and bongs for the 1% cost up to $300,000

Mr. Grey - No, not the one from "50 Shades" - curates an art collection with pieces so expensive that few people can afford them.

The 21-year-old independent curator, who prefers to keep his anonymity, works with artists who have carved out a new niche in Manhattan's art scene: high-end glass pipes and bongs for smoking marijuana.

It's a market that's blowing up, he says, thanks to the growing legalization of cannabis across the country. In the past two years alone, six states have legalized marijuana for recreational or medicinal use, bringing the total to 25 states plus Washington, D.C. that have decriminalized the drug.

He tells Business Insider that the new laws are encouraging artists trained in glassblowing, to experiment with cannabis glass design and create extravagant works of art.

Grey recently showcased 30 pieces in his two-story apartment in New York City. Business Insider got an inside look at the items in the curated collection, which cost up to $300,000.

Keep scrolling to take a look.