Buddha was not interested in true or false, real or unreal. He was interested in how and why things appear to be real. When we see how things arise, we believe that they are real. But when we see that they pass away, then we don't believe that they are real. The Buddhist psychology states that any arising is conditioned, that all phenomena experience dependent origination and dependent extinction.
All phenomena are real only in the relative sense.
However, in the absolute sense, nothing is real. When one has insight, one sees the world as it is, not the way it seems. Looking at a flower, one can see in the same time the sun that warms it, the cloud that feeds it, and the hands that pruned it. This would be in depth perception. However, to penetrate an object or a phenomena, to really see it, our insight needs to be developed through the mindfulness practice.