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It's a Small World: These terrariums can be assembled by children of
any age. All they need is light, the occasional
watering, and a fertile imagination.; By Stephen Orr

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Life on Mars Terrarium: Make a space-obsessed kid the master of the universe by helping him plant a Martian-inspired landscape.; The Plants Air plants, such as these spiky hot pink and purple ones, resemble aliens and don't even need soil. Aechmea, from $12, Bird Rock Tropicals.
The Inhabitants Populate the planet with robots, dark pebbles, and a meteoroid (a.k.a. a rock from the yard). Scarygirl plastic figures, $8 for a 15-piece set, Rotofugi. Stones, $7 for a 5½-pound bag, Jamali Garden.
The VesselA glass orb looks appropriately space-age, and the unlidded top keeps the environment nice and dry. Fishbowl, $18, Jamali Garden.