Inverted Spectrum

The inverted spectrum thought experiment questions whether two people who see colors differently internally—like one perceiving red as someone else perceives blue—experience the same colors despite identical descriptions. It raises the idea that our subjective color experiences might be fundamentally different, even if we communicate similarly. Essentially, it explores whether our internal experiences (qualia) are always aligned or could be "inverted" without us noticing, highlighting the challenge of truly understanding subjective perception and whether external behaviors or language can fully capture our internal sensory experiences.