The celebrated Russian philosopher, Evald Ilyenkov, draws on Spinoza to solve a key philosophical problem: how exactly does the mind connect to the real world? However, the proposed solution has come under much criticism, for example in a recent special issue of Studies of East European Thought (74, 3). This paper aims to clearly explain the solution, overcoming misunderstandings that are evident in the special issue. The kernel of the solution is an argument that human cognition rests on practical activity. (...) In practical activity humans do not act on a fixed structure within their own bodies, in the manner, say, that the activity of water is determined by its fixed structure, H2O. Instead, human practical activity directly connects with and continually adapts to the structures and causal powers of external bodies. Awareness of practical activity thereby gives the human mind access to a mode of activity that is in direct contact and ever-greater accordance with the objects of the real world. The paper will elaborate and develop this kernel, with particular attention to the notion of ‘causal powers’ that it contains, by drawing from the revival in philosophy and the social sciences of what has been termed ‘causal powers realism’. The paper thereby opens new insights and connections regarding the Spinoza-Ilyenkov solution, alleviating the potential for misunderstandings evident in the special issue. (shrink)