Side Stare at Dusk

There’s a notch in the wall
Of the house of good dreams
Where, on a strange day, or

A bad day, or just plain
Day in the low-lit months,
You can stand, just at dusk

Or not quite, with the shade
On all sides kind of grey,
And through the slate blue cloak

Catch one last wink or glare
From the low sun on edge.
Do you know what it means?