In this paper we build on the notion of computational composites, which hold a material perspective on computational technology. We argue that a focus on the material aspects of the technology could be a fruitful approach to achieve new expressions and to gain a new view on the technology's role in design. We study two of the computer's material properties: computed causality and connectability and through developing two computational composites that utilize these properties we begin to explore their potential expressions. Keywords Computational Composites, Connectability, Computed Causality, Expressions, Heat, Materials ACM Classification Keywords H5.m. Information interfaces and presentation (HCI): Miscellaneous.