In Experience Design, we typically learn to design experiences for others, the users. While drawing this distinction between us and them, we block the potential to change who we are by designing for ourselves. Radical alterity means including the Other as part of the Self. It is a concept crafted on decolonial Brazilian anthropophagic tradition, which can be summarized as incorporating foreign ideas through critical digestion. This panel presentation shares the attempt of overcoming "the us and them" relationship by forming collective design bodies that welcome difference and dissensus in participatory design processes.