Broadly, there are two schools of thought with regards to the relationship between orbital cycles and Ice Ages: either the orbital cycles directly force the Ice Ages or the Ice Ages are an oscillation within the climate system that is phase-locked to the orbital cycles. Both of these schools of thought implicitly assume that the orbital forcing makes the climate system "forget" its initial state. Here, Verbitsky & Volobuev perform idealized ice-sheet simulations and show that the system doesn't "forget" its initial state. Furthermore, this system exhibits spontaneous periodicity changes. The authors argue that this behaviour depends on the memory duration of the climate system. Therefore, this work opens an important avenue to be addressed by future research, focusing on the length of the memory of the climate system.