Qualia

Qualia are the subjective or qualitative properties of experiences. What it feels like, experientially, to see a red rose is different from what it feels like to see a yellow rose. Likewise for hearing a musical note played by a piano and hearing the same musical note played by a tuba. The qualia of these experiences are what give each of them its characteristic "feel" and also what distinguish them from one another.
「非親身經驗而不可知」。
意思是說，沒有親身經驗過「紅色」視覺經驗的人是沒有辦法了解什麼叫做「紅色」的感覺。例如，一個出生後就住在只有黑色和白色兩種顏色的實驗室中而沒見過630 nm波長光的人，永遠無法體會「紅色」到底是什麼。直到他有一天走出實驗室，親眼見到630 nm波長光後，他才能體會「紅色」的感覺。
(http://cryofall.blogspot.tw/2006/11/qualia_23.html)

Qualia are the subjective or qualitative properties of experiences. What it feels like, experientially, to see a red rose is different from what it feels like to see a yellow rose. Likewise for hearing a musical note played by a piano and hearing the same musical note played by a tuba. The qualia of these experiences are what give each of them its characteristic "feel" and also what distinguish them from one another.
「非親身經驗而不可知」。
意思是說，沒有親身經驗過「紅色」視覺經驗的人是沒有辦法了解什麼叫做「紅色」的感覺。例如，一個出生後就住在只有黑色和白色兩種顏色的實驗室中而沒見過630 nm波長光的人，永遠無法體會「紅色」到底是什麼。直到他有一天走出實驗室，親眼見到630 nm波長光後，他才能體會「紅色」的感覺。
(http://cryofall.blogspot.tw/2006/11/qualia_23.html)