Actually, when I first saw this my immediate thought was, "How come we're able to graph standard data as icon-sets and not do the same for time? It's two twelve hour cycles, how difficult is that to represent as a graph using iconography?"
And then I realized what you were pointing out and drew my own blue line, horizontally, right through the center of all four items, nodded, and said it looked fine to me. Except (returning to my previous grumbles) for that damn clock. SOMEONE PROPERLY ICONIZE TIME. Please.