Embodied Interaction
Spatial interfaces work differently because bodies work differently than cursors. This is the theoretical foundation.
What is it?
Embodied Interaction, formalized by Paul Dourish in Where the Action Is (2001), is the foundational theory explaining why spatial interfaces create fundamentally different user experiences than screen-based ones. Dourish argues that interaction is not about information processing (the cognitive model) but about being-in-the-world (the phenomenological model). When you manipulate a physical object, you don't 'process information about the object' — you engage with it directly. Spatial computing recreates this directness: reaching for a virtual object, walking through a virtual space, placing content on a surface. This changes everything about how users form mental models, build expertise, and experience agency.
When to use it
When building the theoretical foundation for an XR design strategy. When justifying spatial computing investments to stakeholders. When a team keeps designing 'screens in space' instead of true spatial experiences.
How to do it
Identify where your current design treats interaction as information processing (click → response) vs. embodied engagement (reach → grasp → manipulate).
For each key interaction, ask: does the user's body contribute to the interaction? Can they lean in, reach out, walk around, gesture?
Map the 'directness gradient': from fully mediated (mouse → cursor → button) to fully direct (hand → object). Push toward directness wherever possible.
Test for embodied learning: after using the interface once, can users predict how new elements will work based on physical intuition rather than learned conventions?
Pro tips
The classic anti-pattern: taking a 2D menu, making it float in 3D space, and calling it 'spatial design.' That's a billboard, not embodied interaction.
Dourish's key insight: social and tangible computing share the same foundation. How people interact with objects and how they interact with each other in space follow the same embodied principles.
This is the philosophical backbone for ETL in spatial contexts: emotional throughlines work because emotions are embodied. We don't 'think' relief, we 'feel' it in our bodies. Spatial design can leverage this directly.