Abstract: A door hinge assembly includes: a door frame defining a frame opening and a jamb at one side of the frame opening, the jamb including two frame corners protruding into the frame opening and a jamb brace connecting the two frame corners across the frame opening, the jamb brace defining two spaced-apart hinge holes therethrough; a door movable to selectively provide access through the frame opening, and an elastic cord connecting the door to the door frame, the cord extending sequentially through a first of the two hinge passages, through a first of two passage openings at the jamb edge, through a first of the two hinge holes, across the jamb brace, through a second of the two hinge holes, through a second of the two passage openings at the jamb edge, and through the second of the two hinge passages.

Abstract: A child development toy including a box and a set of flexible sheets. The box defines an interior compartment and an aperture extending into the interior compartment through a side of the box. Each flexible sheet has a corner with a bounded slit surrounded by material of the sheet configured to receive the corner of another sheet inserted through the slit. The set of sheets is configurable as a chain of sheets. Each two adjacent sheets of the chain is releasably connected by a connection formed by a corner of one of the two adjacent sheets inserted into the slit of the other of the two adjacent sheets.

Abstract: An infant play mat with a flexible central mat portion having a fabric surface that forms a first infant play area including multiple flexible flaps. The infant play mat has a polygonal perimeter with multiple straight edges, with two of the edges defining a corner therebetween. Multiple flexible flaps extend from a respective one of the perimeter edges and define a fold line. Each flap has an upper flap surface exposed when the flap is extended, and hidden when the play mat is folded at the fold line to cover a region of the central mat portion. The central mat portion and lower surfaces of the flaps together form a second infant play area when the play mat is folded at all of the fold lines.

Abstract: An infant play mat with a flexible central mat portion having a fabric surface that forms a first infant play area including multiple flexible flaps. The infant play mat has a polygonal perimeter with multiple straight edges, with two of the edges defining a corner therebetween. Multiple flexible flaps extend from a respective one of the perimeter edges and define a fold line. Each flap has an upper flap surface exposed when the flap is extended, and hidden when the play mat is folded at the fold line to cover a region of the central mat portion. The central mat portion and lower surfaces of the flaps together form a second infant play area when the play mat is folded at all of the fold lines.