A few days back, I was trying to build a 3D cell model out of Lego. That turned out to be a failure, which totally crushed my dreams of building a cell out of Lego. But that's not exactly the point of this post.
So I had this plan, and that plan required a lot of 4x2 gray bricks. And so, I started looking for those specific bricks out of the huge pile of Lego that lay in front of me. After a few minutes, I thought I had picked out all of them, and set off to work. Of course, I misjudged my plan, and it turned out that I didn't have enough gray bricks. So out of hopelessness, I took another look at the pile of Lego to see if I might of had neglected a couple of gray bricks. And it turns out that I had. So I went back to work with a fresh new pile of gray bricks, but after a while, I was out again. I took another quick glance at the pile of Lego to see if I might've missed out on some gray bricks (like last time), and hey, who knew that I had! And so, this pattern repeated during my whole process of trying to build a cell out of Lego.