“…There is much work on in materio computing: exploiting unconventional material substrates and their dynamical properties to perform computation, and examining their computational properties and abilities. One of the more advanced is optical computing [33,34]. Other, more exotic, substrates include nuclear spins in NMR experiments [16,17,24,6], liquid crystals [12,13,14], conductive media [21,22], reaction-diffusion chemical systems [19,23,27,32], DNA [3,4], and even slime moulds [2,31].…”