A Dark Room Facing East

[purplie]

A Dark Room Facing East 


A skylight lets flashes through,
the fan shuttering a thin shaft - I'm first struck by the unusual 'sh' alliteration
on 35 mm sheets.
In the heat,
Office chair legs smear faint ash  - ... which then keeps going, blending with 'ch' and 'sm', I would not call it a tongue twister, but I imagine a lot of people reading it out loud are going to mess up some words
shadows to the stem-base, 
which smelts a pitch gash  - here you've lost me, but i suspect it's just my ignorance
from the covers.
Blades gather
under their wings
what shows in cracks:
The man’s face made up
of the strain he was mothering. - mothering a strain, the best image. I expected the alliteration to converge here, but it didn't.

I'm not pointing out defects, just trying to understand what you're doing there.