The 27 Principles

For each visible surface feature, ask: what action produced this? What tool, what motion, what stage of production? Read the object as a series of events rather than a finished state.

Look for where traces intersect or overlap. Which line, groove, or pigment zone crosses which? What was the base form before surface treatment was applied? Where do repairs or additions override original features?

Map all material transitions. Where does one material end and another begin? Is the boundary sharp or graduated? Does the boundary follow physical structure, anatomy, or an independent scheme? What does the boundary quality reveal about how the materials were applied or joined?

Compare wear across all surfaces of the object. Which areas show more abrasion, polish, or smoothing? Does the wear pattern correspond to a logical use position (interior of a bowl, grip area of a tool, worn suspension point)? Is the wear consistent with use or with soil chemistry and burial conditions?

Look actively for evidence of what is no longer present. Are there holes, channels, or abraded areas without their original contents? Residue traces suggesting a lost element? Areas where surface preparation indicates something was once attached? Read negative evidence as positive data.

Ask: is this one production event or multiple? Look for joins and seams that indicate where separately produced elements meet. Are there areas where material, surface treatment, or construction technique changes in ways that suggest a later addition rather than continuous production?

Identify the subject being represented (animal, human, vessel form). Does the pigment or design follow that subject's actual anatomy — color zones where the real animal has color zones, features where the real animal has features? Or does the program impose a conventional scheme that maps onto the object's physical structure instead? Where these diverge, the divergence is significant.

Identify what symmetry type the object appears to be designed for. Where does it achieve that symmetry and where does it deviate? Is the deviation consistent across the object (suggesting a production method) or localized (suggesting a specific event — repair, damage, intentional asymmetry)? For figurative objects, is the represented subject naturally asymmetric and does the object reflect that?

Assess the object's proportions against its apparent function. Are these proportions consistent with the stated or implied use? Does scale suggest personal use, communal use, or display? Where proportions are schematic rather than naturalistic, note what has been simplified and what has been emphasized — the emphasis is usually significant.

Map all color zones. Then test each possible organizing principle: do the zone boundaries align with physical structure? With the represented subject's anatomy? With orientation? With a geometric conventional scheme? Which alignment is most consistent? Where color zone logic is ambiguous or mixed, state that ambiguity rather than forcing an interpretation.

Identify where the highest production investment is concentrated — finest detail, most costly material, most precise execution. Compare this to areas of lower investment. Does the gradient correspond to a viewing orientation, a use position, or a ritual facing? Is investment concentrated on the iconographic content, the surface treatment, or the structural form?

Identify all attachment points: holes, grooves, residue, wear patterns consistent with binding or suspension. For each, determine: what was attached here, how was it attached, and where on the object does this place the attachment in relation to the whole? Can the original assembled object be partially reconstructed from its surviving attachment evidence?

Before analyzing surface content or iconographic program, establish what orientation the object was designed for. Evidence: suspension or attachment points indicating how it was worn or displayed; weight distribution; which face received the most investment; how the design reads from different orientations. Analyze the visual program from the correct orientation first.

Assess all surfaces for evidence of incomplete production: unfinished areas, begun-but-not-completed details, abrupt terminations in surface treatment. Is incompleteness consistent with interrupted production (tool abandoned mid-task) or with deliberate truncation (a conscious decision to stop before what would conventionally be considered completion)? In cache contexts especially, consider whether incompleteness is intentional.

Identify the primary production approach: is the object's form the result of material removed from a blank (look for tool marks, reduction scars, waste removal evidence) or material built up into form (look for joins, accumulation seams, construction units)? For objects that combine both — a coil-built vessel with carved surface decoration, a carved effigy with applied pigment — identify the sequence of subtractive and additive operations.

Edge quality controls where attention lands. Hard edges: maximum neural activation, demand attention, create tension. Firm edges: clear but slightly blended. Soft edges: gradual transition, atmospheric, calm. Lost edges: boundary dissolves, brain completes the form.

Complementary colors create neural balance (consonance). Analogous colors share channels with minimal conflict (consonance). Non-complementary high-saturation combinations create dissonance.

Control whether hierarchy is clear or ambiguous. Stable figure-ground = consonance (easy to parse, clear hierarchy). Ambiguous figure-ground = dissonance (Rubin's vase, Escher — brain toggles between readings).

Use grouping to create visual units that the brain processes as single chunks.

Overlap = instant depth cue, cheaper than perspective.

Negative space is a positive compositional element. The shape of the space between and around forms is as designed as the forms themselves. Closure lets you suggest a complete form with partial information — the brain does the rest.

No color exists independently. Every color decision is actually a relationship decision. Simultaneous contrast affects both value (light/dark) and hue (color shift toward the complement of the surrounding color).

The specular highlight is a material signal, not just a bright spot. Its shape, sharpness, and color tell the viewer what the surface is made of: sharp point = hard/polished; soft diffuse = matte or rough; colored highlight = translucent material (skin, wax, grape); no highlight = matte or absorbent.

Faces are attention anchors whether you want them to be or not. Present faces dominate composition; suggested faces (two dots + line) read as face; absent faces useful when you want attention elsewhere; hidden faces create pareidolic discovery moments.

Gesture and posture read as alive vs. static even in still images. Dynamic posture (weight shift, mid-action), gestural marks that capture movement quality, implied trajectory, natural articulation create biological motion cues.

Gaze = attention vector, more powerful than any compositional line. Direct gaze (at viewer) creates confrontation and engagement; averted gaze directs viewer to look where figure is looking; multiple gazes create attention flow; no visible eyes reduces social attention effect.

Pop-out = instant attention magnet, no conscious search required. Single unique feature in a field of similar elements = automatic salience.