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.

It's a market that's blowing up, he says, thanks to the growing legalization of marijuana across the country. In the past three years alone, nine states have legalized cannabis for recreational or medicinal use, bringing the total to 28 states plus Washington, DC that have decriminalized the drug.

Grey 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.

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

Keep scrolling to take a look.