Equipements which exchange views between two persons.
You can only see through the other person's eyes when you wear these machines, which forcibly put you in the other's place. These were made to obscure the border between identities of two persons. This work has been exhibited in many places. Technically improved each time, however the concept "to make it possible to kiss or to make love with the partner while keeping the machines on" is observed.
(source: www.petworks.co.jp)