The up direction carries telemetry: cells PRESENT signals, organs aggregate, emotions modulate (hormones rise/fall with activity), memory REMEMBERs, the engine DISTILLs into kernels, and SELF curates the survivors. It's how the organism perceives itself and learns. Each layer transforms the signal a little — by the time activity reaches SELF, it's been aggregated, weighted, and filtered into "what mattered".