Most PKM systems are text-first: outlines, bullet points, long-form prose. Visual thinking offers a complementary mode that leverages spatial cognition, pattern recognition, and the brain's massive bandwidth for processing visual information.
Canvas and Whiteboard-Based PKM
A new generation of tools treats the infinite canvas as a primary workspace rather than a secondary feature. Heptabase organizes knowledge on spatial whiteboards where cards can be freely arranged, grouped, and connected. Obsidian Canvas provides a similar infinite canvas integrated directly into a vault. Excalidraw (especially via Zsolt Viczian's Obsidian plugin) bridges freeform drawing with structured note-taking. These tools let you think spatially: proximity implies relatedness, clusters reveal themes, and the spatial layout itself becomes a form of metadata.
Concept Mapping and Mind Mapping
Concept maps (Novak, 1972) explicitly label the relationships between ideas, producing a network of propositions like "cognitive load → reduces → working memory capacity." Mind maps radiate outward from a central concept, emphasizing hierarchy and association. Both externalize mental models in ways that text outlines struggle to match. The key difference: concept maps emphasize typed relationships between concepts; mind maps emphasize branching hierarchical structure.
Sketchnoting
Sketchnoting combines hand-drawn visuals, typography, and spatial layout to capture ideas during talks, meetings, or reading. Mike Rohde popularized the practice with "The Sketchnote Handbook" (2012). The act of translating ideas into visual metaphors forces deeper processing (aligned with the generation effect and dual coding theory). Sketchnotes sacrifice searchability for memorability and engagement.
Zsolt Viczian and Visual PKM
Zsolt Viczian has become one of the most prominent advocates for visual PKM through his work on the Excalidraw-Obsidian plugin and his "Visual PKM" methodology. His approach treats drawings as first-class knowledge artifacts, embeddable and linkable within a broader text-based vault. He demonstrates that visual and textual PKM aren't competing paradigms; they're complementary layers.
When Visual Beats Textual (and Vice Versa)
Visual approaches excel at brainstorming, exploring connections between ideas, providing overviews of complex domains, and communicating structure at a glance. Spatial arrangement activates pattern recognition abilities that sequential text does not. However, textual approaches remain superior for detailed argumentation, nuanced claims, searchability, and machine-processability. The pragmatic answer is to use both: visual canvases for exploration and synthesis, text notes for precision and retrieval.
The Shift Toward Visual-First
The broader trend is clear: PKM is moving from purely text-based systems toward multimodal environments where text, visuals, diagrams, and spatial arrangements coexist. This reflects a deeper understanding that different types of thinking benefit from different representational formats.
Key Points
- Canvas tools (Heptabase, Obsidian Canvas, Excalidraw) enable spatial organization where layout itself carries meaning
- Concept maps and mind maps externalize mental models in ways text outlines cannot
- Sketchnoting leverages dual coding and the generation effect for deeper processing
- Visual approaches excel at brainstorming and overview; textual approaches excel at precision and search
- The trend is toward multimodal PKM that combines visual and textual representations
Open Questions
- How should visual artifacts be indexed and searched alongside text notes?
- Can AI effectively interpret and generate visual knowledge representations (concept maps, diagrams)?
- What are the best practices for maintaining visual PKM long-term without visual notes becoming stale?
References
- Novak, J. D., & Gowin, D. B. (1984). "Learning How to Learn"
- Rohde, M. (2012). "The Sketchnote Handbook"
- Viczian, Z. — Visual PKM methodology and Excalidraw-Obsidian plugin
- Paivio, A. (1971). "Imagery and Verbal Processes"