A yokai of Buddhist ritual implements depicted by Toriyama Sekien in Hyakki Tsurezurebukuro. It appears as a wooden fish (mokugyō) bearing a bearded face like Bodhidharma (Daruma), seated on a round cushion with eyes wide open. Sekien hints it is akin to the Buddhist-tool spirit Harisumori. Because fish were believed never to sleep or close their eyes, the mokugyō symbolizes sleepless diligence in monastic practice. Linked with the legend of Bodhidharma’s nine years without sleep, it is read as a visualization of the ideal of wakefulness.