This chapter introduces those posthuman ideas that we have found most useful in our research with people with dementia. These include: 'thing power', 'intra-activity', 'agentic assemblages', 'affinity', 'trans-corporeality', 'submersion' and 'potentia'. We show how we have used them, drawing on 'data events' from our studies. The methodological issues raised by posthumanism are also discussed and our own practice critiqued. The chapter also acknowledges that posthumanism does have limitations, for example, in addressing the classed structure of dementia care. We discuss how a posthuman ethics has been addressed and present a posthuman ethics of rights for working with people with dementia. This suggests that lifelong learning for people with dementia is not a luxury, but a right. [For the complete volume, "Lifelong Learning and Dementia: A Posthumanist Perspective. Palgrave Studies in Adult Education and Lifelong Learning," see ED612732.]