To begin to even wonder what reality is, we must first look seriously into what we think reality is. This is where the attempt to look into our concepts about life and the universe come into play. Not surprising, we find that it is impossible to discuss a concept without discussing its opposite, just as "left" makes no sense without "right." There is a long list but to begin I will start with a few:
Truth/Lie
Justice/Injustice
Love/Indifference
Friendship/Enmity
Pain/Pleasure
Anger/Acceptance
"I"/"You"
Right/Wrong
Light/Dark
Young/Old
Good/Bad
Masculine/Feminine
Honor/Shame
Fidelity/Sin
God/Satan
Success/Failure
Real Job/Mc Job
Wealth/Poverty
Knowledge/Ignorance
Wisdom/Arrogance
Life/Death
Growth/Decay
And then there are those concepts that stand alone (at least till we really look at them):
Time
Space
So there you have some things to ponder.
Check out these Links for more ideas on specific concepts: