emotion category/modifier: creative, artistic (emotion felt in proverbial/mythical "right brain") - analytic, methodical (emotion felt in proverbial/mythical "left brain")
For example oi roi'i is frustration felt by one's "creative organ", e.g. at failure to get inspired or work out ideas. o'u roi'inai might express satisfaction at solving a tough calculation. roi'icu'i expresses something halfway: like ro'e but stressing the fact that "both halves of the brain" are involved.