Warm sun on your face, a gentle salty breeze, the sound of ocean waves. Your friend earnestly suggests surfing lessons, and you both laugh as you imagine the two of you gracelessly tumbling through the water. Could imagining this beachside road trip together bring you closer, before you even pack your bags? Is imagining a shared future together the first step toward creating one? From friends and family to lovers and acquaintances, people collaborate all the time to imagine shared experiences. They can be as whimsical as make-believe, as mundane as what’s for dinner, or as consequential as the future…