ating steak had never had this effect on me before, but this was my first time at 4 Gats – the quintessentially quirky Catalonian restaurant in Barcelona. Opened in 1897, it was renowned as the foremost meeting place of the artistic, eccentric, and supposed outsiders. I felt immediately at ease; no doubt I was sitting at Pablo Picasso's favorite table. As I drank in the unique ambiance, a weird, yet profoundly wonderful, notion entered my head. A thought experiment – the hallmark of Albert Einstein – consumed my consciousness: what would I do if I saw my younger self at a nearby table? How bizarre would that be? And most irresistibly, would
