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Comment
Traditional "sky shots " can be beautifull or lousy 
The problem is to get the most light through the
flint it must be held up as near into the sun as possible....and that means directly into the camera's metering system.....
with dubious results....
The same amount of strong light comming through from behind;; against a dark backround would seem desireable..
This can be done by using one of those round mirrors ( one side concave to enlarge ) and reflect the sun UP
Different degrees of light intensity and effect can be had with experimenting with flat mirror Vs concave.
Just be very very careful or you could wind up with a handful of fire popped flint 
Gin
Very nice technique! I noticed the translucent area highlighted is round, is this because the mirror is round? What if you had a triangle shaped mirror? Would it light up the whole thing? (I should probably know this from physics class, but that was soooo long ago.)
That severe round was using the concave side of the mirror, if I was to pull the flint away, it would reduce to a pin point....and the flint would explode
The flip side flat mirror has a very wide reflective area, better for a more even lighting
