This article shows how to account for the sociomaterial dimension of distributed creativity in the arts. By following the genesis of a new theatre production, we examined the sociomaterial practices involved to unpack the sociomaterial dimension of distributed creativity. To account for this, we draw on concepts from laboratory studies to explain creative and design work. In so doing, we considered the significance of distributed creative practices that are constituted by intermediaries which we argue, help to outline, refine and develop the creative idea. This article is especially attentive to the professional practices in the rehearsal room; what we called the 'creative laboratory', the locus where material artifact and their potentialities unfold in the process of creating a work of art 'yet to arrive'. Extracts from ethnographic observations are used to illustrate the creative process from the germination of ideas to the collectively arrived at final production. In this respect, the rehearsal room is where initiatives are trialled and tested, and specific aspects of a scene (re)created, to feed into the composition of the emergent theatrical work.