We can present an argument from relativity concerning tastes, odours, colours, sounds, and ‘feels’ like this: Suppose a part of the world or an object in the world displays a certain smell, etc. to one observer O. How it smells, etc. will be a function of O’s particular sensory structures. So, there will be or could be another creature O* with different sensory structures, to whom the same part of the world or the same object would smell, etc. quite differently. O and O* may each live equally efficient, adapted lives. So, there is no reason for saying that just one of O or O* has got the
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