One day, riding my bike down a cobblestone street in NYC I noticed a pretty blue glimmer coming from the side of the road. I pulled over to see what it was and found a small pile of iridescent blue marbles. I wondered how they had gotten there, who had put them there and... why. I picked them up and put them in my bag, wondering why I had to have these marbles rather than just approaching their existence, but anyway… I rode on. At the end of the block I realized that I was in a different place in terms of time (and space) than I should have been, or would have been if first, I hadn't seen the marbles and second, hadn't stopped to pick them up.
I began to think about the times when I actually had time not to have to be at a specific place or doing a specific thing at a specific time. I noticed that often, at those times I would be walking down the street or be somewhere and something really wonderful would happen, kind of randomly. Generally they would be interactions with other people, sometimes people I knew, sometimes strangers, but there would be times when I was low or confused or needed help and wonderful people or things would unexpectedly appear. I decided to get more marbles and put 13 of them in 13 places where I had had such experiences, including where I first sited the marbles.