Perhaps a total solar eclipse? Especially so when seeing half the solar system lined up neatly in a row with the sun and moon (and a comet in case of the recent April 2024 eclipse in the US), and truly feeling that one is riding on a chunk of rock hurtling through space, tethered invisibly to that impossibly distant mass of gas and plasma like a ball at the end of a rope...
Thanks! That's the best Fratres performance I've yet to see (the "wincing frisson" in her facial expressions) -- but this Gidon Kremer performance from 1984 is the best I've yet to hear: https://www.youtube.com/watch?v=DmUE8b5kAQ4
As a complement to the adjacent comment thread on Shoegaze music, I find a similarly dense, soothing, blanketing effect from some recent noise/drone music genres (especially on good headphones, or out loud with a subwoofer), for example:
The pulsing deep noise of Tim Hecker's Piano Drop:
Everything by Carbon Based Lifeforms is also very soothing, albums like Interloper, World of Sleepers, Hydroponic garden also really give me that feeling and with just a bit more beat and melody that I love.
The first track of Interloper just soothes me real quickly:
For those wanting to generate some sounds like the above, I made what is effectively a noisy synthesizer / visual demo a while back that can be played note by note on a PC keyboard (or will play itself if left untouched, see attached readme). But to get it into "wall of sound" territory you need to hold down the up arrow and/or space bar for quite a while to speed up the bike until the visuals start distorting:
Custom OEM size/fit has been addressed to some degree for a quite a while now by both the "mainstream" car audio manufacturers [1] and, more extensively, by some lesser-known aftermarket brands [2].
YMMV based on just how old your car is and the type of OEM head unit, but there are kits (e.g. this one for a 2016+ Honda Civic [3]) that allow you to install "standard" head units with a fit/style similar to OEM.
Still get frisson every time I think about it ;)