Nothing has meaning. Everything is pointless, an inane transient cloud. A single breath of smoke.
Think of all the blood and tears that you pour into your work. What do you actually gain from any of your labouring? Generations flourish then fade each one replacing another that passes, leaving no sign they were ever there, only the dirt that fell from their feet.
The dawn sun drags itself into the sky then falls back down as dusk comes, repeating its dreary cycle over and over with the same numbing certainty. The wind gusts towards the south then changes and rushes north, mindlessly blowing one way then another, constant in its confused and erratic pursuits.
Every drop of water ends in the ocean but the seas are never satiated and so the rivers and streams keep flowing, repeating their tedious cycles again. Every aspect of life inspires apathy and is filled with indescribable monotony. Each dull thing bores the eyes blind and deafens the ears with mundanity.