Cgalo DokuWiki Logo Concepts:
A central part of these concepts is the core concept of wiki: two-way links and collaboration. Red for the possibilities, and green for discovery, and a dark shade of black to convey DokuWiki's simplicity.
The ordering of the rectangles (representing pages) keeps the same order as the current logo. I wanted to stay away from cliché graphic elements such an organized stack of paper as represented by multiple rectangles organized on top of each other in a hierarchical and regular way; I think DokuWiki is a lot more dynamic when people move away from the logic of hierarchical folders for categories and when they embrace the querying functionalities of tags, backlinks, searches, struct aggregations, etc.
Additionally, I'd maybe add to like more curvature to make it less blocky, but I wanna keep away from anything that looks like a cliché 'cycle' symbol (e.g. ♻ 🔄🔁↔️) as these are over-utilized in logos and can mean anything. I want the DokuWiki logo to be distinct.
Retro yet modern:
Simplified modern. Removed yellowing pages.