In Aleksandra’s recently completed philosophical portrait (visible below), the man exhibits soft concentration while the woman exudes a soft composure attained through experience and contemplative practice. Both appear to be thinking together about the non-discursive.
The allusion in the title is to an early Daoist text called Inward Training. In Verse 4, the authors write,
As for the Way:
It is what the mouth cannot speak of,
The eyes cannot see,
And the ears cannot hear.