It has long been a mystery whether Earth’s hemispheric albedo symmetry arises by coincidence or is maintained by a robust underlying mechanism. This work, currently under review at Nature, offers a new perspective on this enduring puzzle. Drawing on more than two decades of satellite observations of TOA radiation budget, together with climate simulations from CMIP6, I frame the problem along a previously unexplored dimension. Although Earth system models struggle to capture Earth albedo symmetries, they suggest that Earth albedo symmetries may be transient features of the current climate state. The study highlights the central role of clouds and their couplings to other Earth system components in regulating the planetary energy budget, and underscores the importance of continued Earth radiation budget (ERB) observations in the decades ahead to advance fundamental understanding of the coupled Earth system.