There is a third perspective on the columns. Column A represents old
understandings that have been so well internalized they have become facts.
Column B represents how new ideas and challenges appear, regardless of
one’s prior level of understanding. The more experienced, advanced, or expert
students will likely find that what was once opaque, counterintuitive, and
complicated has now become obvious, straightforward, and clear. Hard-won
“understandings” have become “facts.” Advanced students can often apprehend
through direct instruction what it takes great constructive labor and
coaching for the less experienced or able student to comprehend.