Indigenous cultures can "see" dark constellations (example: the Australian emu in the sky) which are defined empty spaces which are explicitly visible.

Using this concept, one could think of or use blank index cards in a zettelkasten or even the empty (negative) spaces between cards as "dark ideas" (potential ideas which need to be thought of and filled in).

Link to: https://hypothes.is/a/FlqusEN1Ee6XEr_9StPUlA

https://www.npr.org/sections/health-shots/2023/01/18/1139783203/what-makes-songs-swing-physicists-unravel-jazz-mystery

Spaces in both language, text, and music help to create the texture of what is being communicated (and/or not).

Link to Edward Tufte's latest book in section entitled "Spacing enhances complex meaning, encourages slow, thoughtful reading":

<small><cite class='h-cite via'>ᔥ <span class='p-author h-card'>KevinMarks</span> in #meta 2023-01-19 (<time class='dt-published'>01/19/2023 11:32:19</time>)</cite></small>

Link to Indigenous astronomy example of negative spaces (like the Great Emu)

How can we better thing of card indexes as positive feedback mechanisms? Will describes it as the "Great Wheel of Positive Feedback" which reminds me a bit of flywheels for storing energy for later use.

A solid example of how western cultures dismiss non-literate cultures.

Where are the empty spaces on the internet? How can we design them into existence?