It cannot be seen, cannot be felt, Cannot be heard, cannot be smelt. It lies behind stars and under hills And empty holes it fills. It comes first and follows after, Ends life, kills laughter.

Why this works

This riddle describes darkness in a poetic way, highlighting its elusive and intangible nature. The first lines explain that darkness is not a physical entity that can be perceived through our senses. The phrases about lying "behind stars and under hills" illustrate how darkness envelops everything, existing in the spaces where light does not reach. The lines "comes first and follows after" suggest that darkness is present before dawn and after dusk, while "ends life, kills laughter" emphasizes its association with death and sadness, reinforcing the idea that darkness represents the absence of light and joy.