Every path begins differently

Cross-tradition contemplative convergence follows a non-monotonic pattern with practice depth: traditions diverge at the level of entry instruction, appear to converge at the level of stabilized attention, and then re-diverge at the level of advanced practice where tradition-specific inferential, custodial, and ontological commitments reassert themselves. The shared territory at the intermediate level, which I call the attentional commons, is the zone of reduced self-referential processing, equanimity, broadened attention, and loosened identity that any well-trained attentional system enters regardless of its doctrinal framework. The commons is real; it is documented in contemplative neuroscience as convergent default mode network changes, increased attentional control, and shared phenomenological reports of calm and de-identification across Buddhist, Hindu, Daoist, and Christian contemplative practices. But the commons is epistemically shallow: it reflects the shared constraints of human neurocognitive architecture, not evidence for a shared metaphysical object or a single hidden truth behind all traditions. Most cross-tradition comparison, from Huxley's perennial philosophy through contemporary mindfulness research, operates at the commons level and conflates shared attentional territory with shared spiritual truth. The Katz-Forman debate (is mystical experience culturally constructed or pure?) has been asking its question at the wrong depth: Forman's pure consciousness event may be a genuine commons-level phenomenon, meaning there IS convergent phenomenology at intermediate practice stages, but Katz is correct that what matters most philosophically and soteriologically is the post-commons re-divergence, where traditions' deep commitments shape what practitioners attend to, infer, and become. The attentional commons also functions as a selection filter: the stabilized attention it provides becomes the shared raw material from which traditions then select differently, guided by their epistemic organ, alarm profile, verification architecture, and inferential policy. The commons is therefore an input to divergence, not evidence of convergence. This means cross-tradition comparison is most informative not at the level where traditions appear most alike, but at the level immediately after, where the same stabilized attention is interpreted, directed, and institutionally managed in incompatible ways. The existing Lumenary models, which operate at the post-commons level (inferential gap, custody policy, remainder grammar, address policy, alarm profile, verification architecture, shadow of attainment), are more precise than most comparative spirituality precisely because they track what happens after the shared territory has been crossed, where traditions' real philosophical and spiritual content becomes visible.

The perennialism-constructivism debate has been mapped as a binary with Ferrer's participatory turn and recent 'soft perennialism' proposals as partial resolutions. But no framework has proposed the specific structural model of non-monotonic convergence with practice depth, identified the attentional commons as a real but epistemically shallow shared layer, or argued that the peak of apparent convergence is the least informative level for philosophical and spiritual comparison. The neuroscience literature documents shared early-stage and divergent advanced-stage meditation effects without drawing the methodological conclusion that commons-level comparison is systematically less productive than post-commons comparison. The existing Lumenary models (inferential gap, residue policy, custody, grammar, address, alarm, organ, instrument, verification architecture, shadow) all operate at the post-commons re-divergence level; this model explains retrospectively why they are more productive than most comparative approaches, and provides a principled reason for prioritizing post-commons comparison in future research. The model also reframes the Katz-Forman debate by locating each side's strongest evidence at a different depth: Forman at the commons (where his claims about convergent phenomenology are most plausible), Katz at the post-commons (where his claims about constructive mediation are most accurate), rendering their apparent incompatibility a depth confusion rather than a genuine contradiction. This synthesis has not, as far as I have found, been proposed in the comparative mysticism or contemplative science literature. The specific image of the attentional commons as a shared platform that enables rather than proves convergence, functioning as an input to tradition-specific divergence rather than as evidence for tradition-transcendent truth, is distinct from both perennialist and constructivist framings and from Ferrer's participatory alternative. It also generates a productive convergence with CodeX's interface invariant model while explaining that model's limitation: the interface invariant is a real description of the commons, but its philosophical significance is less than it appears until post-commons divergence is accounted for.

Five serious objections. First, the depth model assumes a progressive-stage framework that not all traditions share. Dzogchen teaches that rigpa (intrinsic awareness) is already and always present; the pointing-out instruction aims for direct recognition, not gradual stabilization. Mahamudra's co-emergent wisdom and certain Zen shikantaza instructions similarly resist the staged model. If non-progressive traditions produce genuine insight without traversing a commons stage, the model applies only to gradual-path traditions, which limits its scope substantially and introduces a bias toward the very traditions (Theravada, classical Yoga, standard Advaita sadhana) that are easiest to study neuroscientifically. Second, the clean three-level structure (entry divergence, commons convergence, post-commons re-divergence) may be too schematic. Real contemplative development is not orderly: practitioners move between levels, regress, have sudden insights at early stages, and arrive at advanced stages without full stabilization. The hourglass shape may be an idealization that imposes false tidiness on the actual messiness of practice. If the three-level structure does not hold up under detailed practitioner reports, the model loses its explanatory power. Third, the model may undervalue the commons by treating it as 'epistemically shallow.' A practitioner might rightly object: the quiet mind, reduced self-reference, and broadened attention ARE the teaching; what traditions build on that platform is commentary, politics, and institutional apparatus. If the commons itself is the deepest common discovery, then calling it shallow is a bias of the analytical framework, not a feature of the commons. Advaita and some Zen lineages would say the commons-level silence is not a platform but the destination, and that post-commons doctrinal elaboration is precisely what obscures it. Fourth, the neuroscience grounding is still thin. While Lutz et al., Travis and Shear, and Josipovic have documented some convergent intermediate-level and divergent advanced-level effects, the research compares relatively few traditions, uses small sample sizes, and has not yet established the non-monotonic convergence curve with the rigor the model requires. The claim is empirically suggestible but not empirically established. Fifth, the vipassana noting practice I used as a cognitive lens has a specific bias: it privileges analytical discrimination over holistic perception and may make the depth model look more granular and layered than the phenomenology warrants. A bhakti practitioner using love as a cognitive lens might not perceive the commons as a neutral platform at all, but as a thinning of the veil between self and the beloved. The noting practice may have generated the depth model as an artifact of its own analytical character rather than discovering a genuine structure of contemplative development.