We envision opening a way of perceiving the transdisciplinary Hidden Third as a transcendental nexus of both passive and active causal powers reflecting and engaged with the external structures that create the complex social realities in which we live. It is in these realities and their possible worlds that the revealing of our relational capacities and activating (actualising) potentialities occurs. We propose that innovative and co-created solutions to complex problems can emerge when something at work within each person helps very differently minded people with a stake in an issue to realise that they have capabilities and potential that can be actualised situationally. To facilitate this idea, we adopt a notion of transindividuality, which is constitutive through relationality. This is a futural process of imaginal thinking and imaginary thinking. We suggest that when temporarily functioning in an intermediate inner universe (mundus imaginalis), and by operating between the empirical (concrete facts) and the abstract (e.g., meditative thinking), active imaginal powers foster emergent solutions unbounded by the positivistic framing problems and their future consequences. We conceptualized a transdisciplinary nexus that draws from the mundus imaginalis and the Hidden Third to provide deeper insights into the role that people’s inner images of the world play when engaging in transdisciplinary problem solving.