Literal bridges

I'd like to share a recent experience I had helping build a bridge here. Many people were working together doing different jobs. I was on rock shoveling and sand bucket refilling detail in the concrete mixing assembly line. At one point in the day, it seemed my results were futile because my job was to refill baskets with rocks and buckets with sand, but all day no matter how many baskets or buckets we filled, more empties came to replace them! At this realization point, I decided to take a short break, walk over to where they were taking the grey liquid by wheelbarrow and see down the tarp-covered wooden chute that progress was definitely being made. Obvious metaphor/cosmic lesson from a mundane Earthly experience: many times the work we do bears fruits we cannot immediately see. The efforts I'm making to clean my mind through meditation which seem like a lot of work with little resutls in the mean time will come to bear fruit in the future. :)