Advaita Vedanta (R1)
Vivartavada & Adhyasa: The world is an apparent modification, and the separate ego is a superimposition on the one undivided Brahman.
Analytical Idealism (B5)
Universal mind: The physical world is the extrinsic appearance of mental processes. Individual minds are dissociated alters.
Consciousness is the primary substrate of reality. Materiality is only how conscious processes look from the outside.