Motivating a non-negligible prior \(P(D)\) for design is especially challenging in the framework of the ur-probability solution to the problem of old evidence because it constrains the background evidence to facts that do not entail the existence of life. Collins argues that if we focus only on a limited class of constants \(C\), the background evidence that we can use to motivate the prior \(P(D)\) is allowed to “includ[e] the initial conditions of the universe, the laws of physics, and the val