Light & Engineering Vol. 23, No. 2, pp. 4-11, 2015 Svetotekhnika No. 3, 2015 ON THE RELATION BETWEEN UP-DATED COLOUR VISION AND ARCHITECTURAL LANGUAGE THROUGH THE WARM-COLD COLOUR OPPOSITION Lucia R. Ronchi Giorgio Ronchi Foundation, Florence, Italy E-mail: luciaronchi@palenque.biz ABSTRACT The present paper deals with the conjunctions and interactions between various disciplines, which explore human visual response and the semantics of colour, based on the language representation which operates on the higher levels in the brain than neural, non-language visual representation. <...> A question arises of the consequences for interdisciplinary conjunctions, involving the Vision Science and Lighting Engineering on one side, and Architecture with its allied fi elds on the other side. <...> However, a team of visual experts has shown that a plethora of physiological effects, identifi ed by traditional visual research at the neural (non-language level), which are not involved in the perturbations of the visual system, are successfully linked to language representation. <...> In particular, this link, which is mediated by the environment (the favoured explanation after the infl uence of daylight, which lacks predictable neural mechanisms), explains the fact, reported but not explained in classical text books, that colour appearance can be communicated to others exclusively through language. <...> The recent standardisation (2010) comes to be of interest (Biggam,2012, p.75) in this context, demonstrating the limited number of routes by which colour catego4 ries are added, based, in particular, on the opposition between red and yellow warm primaries and green and blue cold primaries, fl anked, separately, by white and black. <...> The debate of these facts in architectural studies is discussed. <...> Keywords: revision of colour vision modelling, colour appearance, warm and cold colour opposition, neural (non-language) and language internal representations, their difference in hierarchical levels, semantics of colour and architectural language 1. <...> INTRODUCTION The conjunction between different research fi elds is multidisciplinary, it involves several dimensions and ought to be explored in an encyclopaedia rather than a simple paper. <...> For instance, Vision Science, Lighting Engineering, Architecture and their allied fi elds share some particular dichotomies. <...> First, daylight, traditionally regarded as “optimal”, has been rejected as such, due to a lack of the required physiological mechanisms <...>