A cool for seeing LOS from the miniature's perspective without
knocking things over leaning into the battlefield.
Buying supplies for this is pretty straightforward. The trickiest
part is the mirror. Don't waste your time and energy trying to
find 2" x 3" mirrors that are already made. I went down
to Home Depot (a local DIY warehouse store) and bought a single
12" x 12" pane of mirror for a whopping $2. Ideally,
a glass store would be the place to get it cut into pieces. You
can also try a hardware store. I ended up at a framing store,
under the assumption that they have to make prety cuts of glass
for their picture frames and I was right. They happily chopped
it up into 24 pieces of 2" x 3"; periscopes all around!