So colours can be seen. Smells can't be seen, but of course, smells, you know, the smell of coffee can be sensed through the five senses.

颜色可以看得见，味道看不见，但是当然了，味道嘛，咖啡的味道能通过,其他的感官感知到。

耶鲁公开课 - 死亡课程节选