The Diamond Sutra says that all formations are always appearing and disappearing. If you view all appearances as non-appearances, then you can see Buddha.
If you want to see Buddha, Buddha has already disappeared. If you don't want to see Buddha, then seeing, hearing, smelling, touching, tasting - everything is Buddha. The flower is red, the tree is green, the sky is blue. You and these things are never separate. Then you are Buddha.