This last summer I began an enterprise: a terrarium business.
A key feature of a terrarium is its closed top.  This closed top makes it possible for us to use terrariums for medicinal purposes.  It is quite simple really; the top collects the oxygen produced by the plant, allowing the oxygen to be inhaled for a daily mental boost. 
            I attribute these mental boosts for my idea to sell the boosts themselves.  A good portion of my customers came from friends and family, but I was able to sell a few to strangers at a local street fair in my home town.  My marketing scheme, which you might have guessed already, was to offer “Free Hits of O₂” with the hope that the mental stimulation provided by the O₂ would help the customer realize his/her need of a terrarium. Although I recognize that your brain is not presently heightened on O₂, I still believe in your ability to see the void in your life. You know where to contact me when, not if, you need one.