Bunk bed
For a few childhood years I shared a bunk bed with my older brother. It was relatively simple and utilitarian, not some huge, fancy-pants furniture like what's available now. He got the top bunk because he was older: a privilege of seniority. I remember it was fun sleeping. Meanwhile, my younger brothers shared a near-identical bunk bed in their own bedroom across the hall. We tried to parachute out of the top bed with a canopy of green plastic garbage bags, making the ceiling light fixtures rattle and shake downstairs. Mom yelled up that we should “Go outside and play!” The parachuting didn’t work, but we had to try it, because a bunk bed invites that kind of stunt.