"...all organisms are thus born into a semiosphere, i.e. a world of meaning and communication: sounds, odours, movements, colours, electric fields, waves of any kind, chemical signals, touch etc. The semiosphere poses constraints or boundary conditions to the Umwelts of populations since these are forced to occupy specific semiotic niches, i.e. they will have to master a set of signs of visual, acoustic, olfactory, tactile and chemical origin in order to survive in the semiosphere. And it is entirely possible that the semiotic demands to populations are often a decisive challenge to success. Probably more than anything else organic evolution has to do with the development of ever more sophisticated means for surviving in the semiosphere." (Encyclopedia of Semiotics)

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