Forts, tree houses, swings, tires on a rope, are all props for stimulating a great imagination. They also make wonderful memories.
We had an ordinary old chicken coop when I was a kid. It didn’t have chickens, but proved a fun place to store bikes and play house.
When I asked my Dad to make it “bigger” he chuckled and wanted to know “just how much bigger” did I want my playhouse? Wise old Dad never said no or yes, he just let me dream about a bigger house.