Where's the title from?

The title of the blog is from a poem I wrote about my favorite Matisse painting in the Albright Knox Art Gallery:
 

Matisse’s Notre Dame in the Late Afternoon
 
This lavender periwinkle
view from a window along
the Seine stops me
every time must sit stare
imagine being there
satiated by light, exhaust,
pain au chocolate
as though never left Left
Bank loved those months
of freedom exploration
loved those long walks,
cafés, resting a head
on his tall shoulder,
reflections in subway panes
of his gentle kiss along
my neck, smell of diesel,
urine, roses, all the rest,
painting reels in images
through the love painted here-
the only thing-
reminded as the shadow
of my writing hand runs on
before me, Notre Dame
a perfect block of purple.
Is it sun setting gives color
superimposed on others?
Like his flesh on mine?
What is there now but this
shadow running on past purple,
a figure in the foreground
unreachable like death,
until we are there. 

 
I am frequently inspired to write a poem when experiencing a work of art. More of this later.