It happens to me all the time with ENTPs.
I could say: "The grass is green."
A debate about the grass ensues.
In reality, the colour percieved is actually inverse of whot the 'real' colour is. Things reflect light which is a different colour than themselves, and absorb colours which're identical to themselves. Therefore, a 'green' object will appear to have no green in it at all because it absorbed the wavelengths correlating to such.
Because of this, the grass is in fact not green at all, if yeu want to see whot grass 'really' looks like, take a look at a negative from an older camera.
There's also issues relating to atmospheric interferance, lighting conditions, and so on.