II.in [美 ɪn, 英 ɪn]副in often appears as the second element of certain verb structures in English (close in, hand in, stand in, etc). For translations, see the relevant verb entry (close, hand, stand, etc).
During the following years, she was enormously productive, and by 1966, she was experimenting with room-size, freestanding installations that incorporated mirrors, lights, and piped-in music.