Though an opuscule is typically small ...
Add to ideabook by Kirk Wood Homes by Kirk Wood Homes
... it can live large.
Add to ideabook by Keith Willig Landscape Services, Inc. by Keith Willig Landscape Services, Inc.
An opuscule can be a children's play set with the simple addition of a roof and railing to define and enclose the space. The addition of a small chair completes the transformation of the space from a pass-through to a destination.