The answer is: Winnowing barley

Ruth 3:2

When we think about the threshing floor, it's easy to picture a wooden area full of action and the hustle of harvest time, but there’s a deeper significance to this setting in the story of Ruth. Winnowing barley – which Boaz was doing – isn't just about separating grain from chaff. It symbolizes a pivotal moment of reckoning and potential new beginnings, much like how the season shifts from the hard work of harvest to the joyful anticipation of the blessings that grain will bring.

Interestingly, the customs of ancient Israel offer rich layers to this narrative. Threshing floors were community gathering spots where farmers not only worked but also resolved matters of relationship and kinship. This is telling, considering that Boaz himself is a "kinsman-redeemer." It’s if to say that amidst the dust and fuss of grain separation, relationships and social bonds were also sifting and sorting—setting the stage for what happens next.

And speaking of significance, we can't overlook Ruth here! It’s her initiative that brings her to that threshing floor, seeking Boaz’s protection and asking for him to fulfill his role as a redeemer. This boldness transcends her foreign lineage as a Moabite, demonstrating that incredible stories often arise from risk and trust. This wecher well-laid floor stands as both a literal and figurative space where identities, securities, and destinies are redefined. Isn't it fascinating how each grain of context adds flavor to these ancient tales!