Rikyu's grandson Sotan explored Wabi to the extreme, and created the smallest Chashitsu called "Ichijo-Daime" with one guest mat and a short mat for the host, which Rikyu had once tried to make but given up.
利休の孫宗旦は究極の侘びを追求して、利休が試みてすぐ廃した一畳台目という極小の茶室を生み出した。