Drive By "Shoot"

There's been lots of writing on these pages about the revising of stories, particularly the stories of science.
Here's a revision in the form of pictures (as we know, somewhat less "assailable...,"
but looks to me as though the jury's still out on the question of revisability...)

I came into work earlier this week, made the same trek up the center stairs of English House I've made for the past two decades,
and was stopped in my tracks by