ðeɪ wɜː kənsˈiːvd ænd kənstɹˈʌktᵻd baɪ kɹɪstˈiːn tˈɑːməs ænd dʒˈuːliə bˈɑːɹtən ænd ɪnstˈɔːld ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti wˈʌn fɔːɹ wˈɔndswɜːθ bˈʌɹoʊ kˈaʊnsəl.
They were conceived and constructed by Christine Thomas and Julia Barton and installed in 1991 for Wandsworth Borough Council.