I saw the labourers and gardeners, completely packed and full, there was no space to put even a single grain.

This couplet paints a vivid picture of extreme crowdedness. It describes seeing laborers and gardeners so packed together that there isn't even the tiniest speck of space left. Imagine a place so full, you couldn't possibly fit another grain of sand! It’s a wonderful way to express a scene bustling with people, where every corner is occupied, leaving absolutely no room to spare. It highlights how utterly full and busy a particular place or situation can be.