"Panta rhei," "everything flows": with these two simple yet profound words, Heraclitus of Ephesus, in the 5th century BC, defined what he considered the disordered and ever-changing order of the cosmos. And he was not wrong. Perhaps that is why, many centuries later, Goethe, with his intense romantic passion, cried out, "Stay, moment, do not be so fleeting." And perhaps for these same reasons, a large part of humanity has striven throughout history to grasp a present that eludes us all like sand through our fingers—ungraspable, unfindable, imperceptible.