This chapter examines whether consciousness develops through measurable levels that reflect different relationships between ego stability, neural flexibility, and access to broader cognitive possibility space. If consciousness operates as a recursive boundary between quantum openness and classical stability, then evolution may have distributed different configurations of this boundary across populations to solve different adaptive problems. From this perspective, lower levels of consciousness would support rapid, rigid, survival oriented processing, while higher levels would allow greater flexibility, wider perspective, and reduced attachment to fixed identity structures. Drawing on research from Carhart-Harris, Friston, Cook-Greuter, Meling, and Radin, the chapter explores whether modern neuroscience and contemplative science converge on evidence for this spectrum. Studies of psychedelics, meditation, and non-dual awareness point toward measurable changes in Default Mode Network activity, alpha oscillations, and DMN-TPN anticorrelation, which may reflect different degrees of ego rigidity and openness. Developmental psychology describes a similarly uneven population distribution, where more conventional stages are common and later stages of postconventional awareness are relatively rare. The chapter proposes that these findings may be read together as evidence for emergent levels of consciousness grounded in biology, neural dynamics, and thermodynamic tradeoffs. In this view, consciousness development reflects gradual changes in how the brain stabilizes identity, regulates uncertainty, and modulates access to wider possibility space. The chapter also considers suggestive evidence that trained contemplative practice may alter how consciousness interacts with quantum systems, which opens the question of whether consciousness development leaves measurable signatures across neural, experiential, and physical domains.