This article is a dialogue across the practices of philosophy and live performance. Martin Heidegger's 1955 lecture 'The Question Concerning Technology' is used increasingly to problematize practices of computational art, in this article his ideas are grounded in the improvisational practices of two art projects: the wearable computing installation called 'whisper' and the performance using 3 different motion tracking and capture systems called 'immanence.' These projects demonstrate an approach to technologies in performance that enhances otherness and the unpredictability associated with improvisation, thereby lending weight to Heidegger's claim that one turns to art to better understand technology because "the essence of technology is nothing technological".