The world as a mirror
Like an emotional movie projector, "projecting" refers to a behavior in which we project our own internal beliefs, feelings or experiences onto someone else when we feel they are inappropriate. Shadow material is especially susceptible to being projected onto someone else. Look around you? Does you view everyone as a cheat? A gossip? A liar? Does everyone around you seem angry? Unhappy? Fearful? You may be seeing your own shadow projected onto others.
The Mexican culture has a wonderful saying which translates roughly into English as, "The lion believes that all are like him". That about sums it up.