Light-weight resilient building unit

A building unit from a plurality of which a play structure is formed, comprising

• a pre-shaped, one-piece core formed from a lightweight, resilient foam subject to ready deformation, said core being in the shape of a generally cylindrical log having opposed planar portions formed in its periphery and opposed recesses formed in each end thereof, said recesses being shaped to mate with similarly shaped recesses formed in other, similarly shaped logs,
• and an outer covering for said core, said covering being formed from a fabric having the same shape as said core and encasing it snugly without substantial gaps or air spaces, said covering having formed therein a means for permitting the removable insertion of said pre-shaped core within said covering, and further formed therein a means for removably retaining said core within said covering after said core has been located therewith,
• said unit being at least about 2 feet in length and having sufficient structural integrity that it is useful as a unit from said plurality of which a play structure is formed of at least a size that will accommodate a small child in its interior and which structure, upon demolition, will cause only minimal or no discomfort to an individual in close associated therewith.