"There's a large body of thought that views not just ideas but other content such as 'concepts' and 'information' as irreducibly and necessarily non-physical." (source section 25) And a concept is viewed as a non-physical representation of something from the physical world. "In truth, there is nothing more mysterious about ideas, concepts and information than there is about categories (and, arguably, ideas, concepts and information are no more than the modern instantiation of categories)." (source section 25)