When a person sits on the floor as a greeting, he takes out a folded Sensu from within the front overlap of his kimono (usually) and places it in front of his knees, before saying his greeting or thank-yous, considering the folded Sensu as a border line.
座って挨拶をするときに、胸元から畳んだ状態の扇子を自らの膝前に置き、それを境にするように相手に礼を行う。