I remember being endlessly entertained by the adventures of my toys. Some days they died repeated, violent deaths, other days they traveled to space or discussed my swim lessons and how I absolutely should be allowed in the deep end of the pool, especially since I was such a talented doggy-paddler.
I didn't understand why it was fun for me, it just was.
But as I grew older, it became harder and harder to access that expansive imaginary space that made my toys fun. I remember looking at them and feeling sort of frustrated and confused that things weren't the same.
I played out all the same story lines that had been fun before, but the meaning had disappeared. Horse's Big Space Adventure transformed into holding a plastic horse in the air, hoping it would somehow be enjoyable for me. Prehistoric Crazy-Bus Death Ride was just smashing a toy bus full of dinosaurs into the wall while feeling sort of bored and unfulfilled. I could no longer connect to my toys in a way that allowed me to participate in the experience.
Depression feels almost exactly like that, except about everything.