When I was seven and my foster dad gave me a chance to choose one marble from the prized collection formerly curated by his estranged son, I picked the one that differed from the bright multicolored ones in its size. It was pastel blue in a shade Crayola never reproduced exactly. Its background is a blue sometimes seen when the sun is low in the sky and the clouds whirling through it are lighter with a threat of rain but also sunshine, depending on the direction from which you are looking.