It's rarely holistic, but just with some sort of stimulus connecting wich each other. Many "normal" people say they like some numbers better and if they are asked why, they might just say that "2 sounds so friendly and 3 is so rude" like they were people. I admit to having some seemingly irrational opinions on what colors should smell, but I am not a real case cos they don't occur to me spontaneously. A person I know is a syn and here's a link to what some stuff seems to her:
http://www.astro.helsinki.fi/~ajlilj...aesthesia.html
Writings on synesthesia, resources and organisations and such:
http://www.doctorhugo.org/synaesthesia/index.htm
I skip that epsitemoly part right now cos I am tempted to start on lecturing stuff I learned in the philosophy of the mind course and everybody can take a book and read how someone more equipped to debate that than me reviews the current philosophical insights on this, in the light brought by newly developed cognitive sciences.
So what would it be like if we all got that.. whatshallIcallit, talent?
The culture would be really different. I can't think of all the possible ways it would change things, but somehow I think it would be more chaotic what comes to expressing experienced data and getting others to understand what we are feeling or seeing.