The more one meditates on the deep nature of Intrinsic Awareness, the more mysterious It seems. For instance:
Where is It right now, in physical space?
In Zen there is always an instant when the mind stops and you break out in a cold, shivering sweat at the sheer vividness of This.
Joshu's "Mu" is really just the "natural freedom of the myriad Buddhas" and is in itself clear about everything. There is no point in trying to make anything special out of it.
This afternoon clumps of snow are falling from the tops of the tall Douglas firs. Crows are taunting each other wickedly. A big cloud just covered the sun. Ah!