In Whitehead's philosophy, an operation of judgment may be directed toward particular perceptions (for example, «perceiving this stone as not grey» or «perceiving this stone as grey). (religion-online.org)
Looking inward «into what I call myself, I always stumble on some particular perception or other.... (firstthings.com)
It is rather a particular perception of the world and our destiny, what Luther came to call looking at all things through suffering and the cross. (religion-online.org)