Why you stayWhile the weekday crowd features its share of suits and power-dressers, Terrarium is more concerned with pleasure than business. You enter at street level, ascend a switchback staircase, wave at the chefs in the open kitchen, and then emerge in a glass-encased chamber filled with sound, revellers, plant-life and a serious collection of rare and top-shelf spirits. When the sun’s out, the fun also spills out onto the rooftop terrace. Energy levels are high, not least behind the bar where fast-moving bartenders mix the classics and creative house drinks. Their technique is sharp, their glasses are primed for social-media close-ups, and they’re committed to keeping the party going.