Interface Structures
Interface Structures are the structural patterns that organise information and reasoning at the interface level. They are how the interaction model becomes architecture — how epistemic relations are encoded in spatial, temporal, and relational form.
Three primary structure types — field, sequence, and comparative — each encoding a different dimension of the epistemic relation. Together they form the scaffolding of any Lucid interface.
In conventional interface design, structure is organisational — it arranges content so that users can find what they need. Structure is a navigational aid, a filing system made visible. The content and its organisation are separate concerns: the same content could in principle be arranged differently without loss of meaning.
In Lucid interfaces, structure is epistemic. The way information is organised is not separate from its meaning — it is part of the argument.
When two claims are placed side by side, that placement asserts a relation. When a sequence of states is laid out in order, that order encodes an epistemic progression. When positions are arranged in a field, their relative distances encode proximity of meaning. The structure is not a container for the content — it is a claim about how the content is epistemically related.
This is what it means for structure to be epistemic scaffolding: not that it supports reasoning from outside, but that it encodes reasoning within itself. Interface Structures are the three canonical forms through which this encoding occurs.
Each structure type encodes a different epistemic dimension. Field structures encode spatial relations, sequence structures encode temporal progression, and comparative structures encode relational contrast. Together, they cover the full geometry of epistemic scaffolding.
Field structures organise information as a positioned landscape — a space of relations rather than a list of items. Derived directly from the Epistemic Field Model, they make epistemic proximity, tension, and position visible. A field structure does not merely display information; it places information in relation. The user can see where claims stand relative to each other, where tension exists, where there is convergence. Field structures are the primary spatial form of epistemic scaffolding.
Sequence structures organise reasoning temporally — as a progression through epistemic states. They encode the movement from divergence through navigation to convergence, making the reasoning trajectory visible and navigable. A sequence structure is not a timeline of events; it is a structured unfolding of epistemic engagement. The user understands not just where they are in a process, but what kind of reasoning each stage demands and what has been established before.
Comparative structures organise information relationally — placing positions, claims, or approaches in explicit contrast or alignment. They are the structural form of the dialectical move: making two or more epistemic positions simultaneously visible so the user can reason between them. A comparative structure does not advocate for one position; it creates the interface conditions in which the user can hold multiple positions and navigate the relations between them.
The three structure types map to three fundamental dimensions of epistemic encoding: spatial, temporal, and relational. Each dimension carries distinct argumentative force.
Interface Structures do not emerge from design conventions or precedent. They are derived from the Lucid Interaction Model — the three-phase architecture of epistemic engagement. Each structure type corresponds to a structural requirement of the model: to open an epistemic field, to support navigation through it, to enable convergent synthesis.
Field structures support the divergent phase — they make the space of positions visible simultaneously, without directing the user toward any single one. Sequence structures support the navigational phase — they make the epistemic trajectory legible, giving the user a sense of where they are in the reasoning arc. Comparative structures support both navigation and convergent synthesis — they make the relations between positions explicit enough to be reasoned about.
This derivation is non-optional. An Interface Structure that is not grounded in the Interaction Model is simply a layout decision. The epistemic force of structure — its ability to do cognitive work rather than merely organise content — depends on its derivation from a principled account of how reasoning engages with information.