With respect to the use of this sparkling coloured material [butterfly wings, around 1955] – the constituent parts of which remain indistinguishable – with the aim of producing a very vivid effect of scintillation, I realised that, for me, this responds to needs of the same order as those that formerly led me, in many drawings and paintings, to organize my lines and patches of colour so that the objects represented would meld into everything around them, so that the result would be a sort of continuous, universal soup with an intensive flavour of life.

p. 116 - Prospectus et tous écrits suivants, 1967