Another door

The door slides open, and to your surprise there are no garden tools or bag of soil. You step into the shed and it's dark inside. Chiding yourself for being silly, you're about to turn around and go back to the house, when you notice a ray of sunlight coming from the far corner of the other side of the shed. You strain your eyes to see better, and it looks like there's an identical door, which wouldn't be that unusual except you know there's supposed to be a wall behind the shed. Why would there be a door that opens into a wall, you wonder.

Intrigued, you walk over to the other door. You can hear birds chirping through the opening. You jerk your head back to the door you had entered through and hurry back to the entrance of the shed and stick your head outside, listening closely. There are no birds chirping. Then, you pull your head back and return to the other door, putting your ear close to the opening. There it is again, the sound of birds chirping loudly to a pleasant tune.

Taking a few deep breaths to compose yourself, you reach for the door and slide it open to the side.