What greatly attracted me - and it was the main line of advance of Cubism - was how to give material expression to this new space of which I had an inkling. So I began to paint chiefly still lifes, because in nature there is a tactile, I would almost say a manual space... that was the earliest Cubist painting - the quest for space.
It is the limitation of means that determines style, gives rise to new forms and makes creativity possible.
Colour could give rise to sensations which would interfere with our conception of space.