Day was heavily influenced by the mysticism of Rudolf Steiner and his architecture reflects his spiritual and psychological concerns with creating “soul-nourishing” environments.
Cafodd cyfriniaeth Rudolf Steiner effaith fawr ar Day ac mae ei bensaernïaeth yn adlewyrchu ei bryderon ysbrydol a seicolegol ynghylch creu amgylcheddau “ soul-nourishing ”.