The Climatron is my favorite, warm, humid and full of bromeliads and tropicals. There are always at least a few orchids in bloom and citrus scenting up the house. Ceiba's namesake trees continue to reach higher to the ceiling each year. The sound of water is ever soothing.
And even better, they have so much fun that they don't even realize how much they are learning and the neat little gardeners they've become.