We hold certain beliefs when it comes to how we make friends in adulthood. We imagine our bond will be forged through a shared interest – a hobby, maybe, like a book club or finding each other in the local yoga class every Saturday. Or it’s a life-phase thing – children at the same school, working in the same office or living in the same part of town. But part of the joy of friendship is its indefinable quality. There is simply no predicting when you might meet a kindred spirit. Some of the most beautiful friendships might also be...