Hexagram 52 of the I-Ching is made up of a doubling of the trigram for mountain. I had it tattooed on my wrist. The interesting thing about #52 is that, when read in reverse, it is Hexagram #51, made up of double thunder. It represents shaking up the system, cleansing it, and initiating new beginnings. It is a beautiful, awesome symmetry.
Hexagram 52 – Stillness
I cannot ride
farther than the cliff’s edge. Ahead,
ridges of snow
smother the north frontier.
A hundred lands
must lie beyond the horizon.
A hundred stars
shine but cannot be touched,
while I fret, small
as a cricket on a boulder,
too weak to cross
even the slightest crack,
and then I think
of this mountain ledge that stops me.
I imagine
that I am the mountain,
and when I do,
the stars and distant lands revolve
around my heart
of stillness and silence.
from The Living I Ching by Deng Ming-Dao
108zenbooks 
Stillness and thunder together, sounds like this primodial Emptyness where nothing is stationary, and which is the source of everything.
Hadn’t thought of that… I like it! Tattoo is on the Triple Warmer Meridian (have the double fire on the heart meridian) so I was using it to remember to take calm, skillful action and to “roll that thunder out” when necessary. 😉
Another amazing poem, I had to hold my breath (and the seat of my chair) in the end.
The double lightning rod is a strong symbol in Himalayan Buddhism. It has the power to destroy all evil, but nothing can destroy it, itself.
Joseph, thank you for the gentle energy you bring to this space. I love playing with the I Ching, not for any predictions but for the wisdom in the teachings of balance and energy flow.
Following your lead, I found this about the dorje: Associated with skill and compassion, it is regarded as indestructible and has the power to cut through ignorance. How wonderful… it fits right in with the theme of Compassionate Action – and what I need to practice, practice, practice!