Cullen's first performance with theremin was in 1972, in collaboration with composer Greg Schiemer, electrical engineer Phil Connor and architecture student Manuel Nobleza.
An Australia Council for the Arts grant in 1972 funded her travel to the UK and Europe, Africa, Nepal and India, including study at the Folkwang Hochschule in Essen.
[8] During that time she inspired and developed the choreography and ideas for Inori, a meditative work in which a dancer conducts an orchestra with positions and gestures of prayer based on mudras.
[9] After returning to Australia in early 1974, she organised, and with dancers and musicians performed at, a long Seminar held at Sydney’s Central Street Gallery (1–11 July).
[7] An expanded version of this exhibition was held in 2023 at the McClelland Sculpture Park and Gallery in Melbourne; Iran Sanadzadeh performed on her pressure-sensitive floors, developed from Cullen's work.
She spearheaded building new technologies for dance in the early 1970s with a range of large Theremins, pedestals, her own pressure-sensitive floors, and many other instruments she and her collaborators built.