IT was an unseasonably hot Saturday in April, and the three dozen terrariums on display in a booth at the Brooklyn Flea were sweating, the moisture turning into beads on their glass containers. Katy Maslow and Michelle Inciarrano, who were selling the miniature gardens, answered questions from passers-by. An antique magnifying glass sat nearby, for those who wanted a closer look.

Some of their creations have an irreverent sense of humor: small verdant worlds that feature scenes like muggings, complete with tiny shadowy scoundrels. Others are simpler, more elegant arrangements of stones and mosses.

The two friends, who spend most of their weekends “antiquing and junking,” Ms. Maslow said, use repurposed vessels like old apothecary jars, cake stands and decanters to make the terrariums, which seemed at home among the vintage furniture and clothing and artisanal food at the market in Fort Greene.

Ms. Inciarrano, a 33-year-old photography student, was the one with the green thumb, who suggested they fill their finds with plants and figurines, said Ms. Maslow, 31: “I had not thought of terrariums once in my whole life.”