Like hearing multiple octals at the same time, when you’ve only ever heard one?

Like feeling cold and hot, when you’ve only ever felt uncomfort?

Like tasting sour and sweet, when you’ve only ever tasted bitter?

Like going to the country and smelling nature, when you’ve only ever smelt the smog of the city?

EDIT: no wait, that’s for someone who is partially blind, don’t think it works for someone who has never perceived sight.