A chain mail mesh comprising interconnecting, polygonal links suitably interconnected to define a sheet having each of the interconnecting, polygonal links having at least one degree of freedom of movement in at least one direction with respect to its neighbouring polygonal links wherein each of the interconnecting, polygonal links, interconnected to at least one neighbouring interconnecting polygonal link, combine to form an operative upper surface and an operative lower surface of the sheet, and wherein at least a portion of at least one of the operative upper surface and the operative lower surface of the sheet generally feels smooth with gaps, which produce a calming or pleasing effect when contacted with or moved over, or combinedly contacted with and moved over a human's body portion which being apt to sense of touch. The sheet has a predetermined drape coefficient, nonlinear motion, and is capable of providing relief in stress or pleasure when a human employs the same.

Disclosed is an articulated assembly of two links for a ballast removal chain, a first of the two links comprising a single-piece member having two flanges which are parallel to one another and each of which has a through-hole, a second of the two links comprising a single-piece member comprising a guide flange that is inserted between the two parallel flanges of the first link, the guide flange being penetrated by a guide hole, the articulated assembly further comprising a hinge pin that is inserted into the guide hole and the through-hole in each of the two parallel flanges. The guide hole is reinforced by a bushing designed to receive the hinge pin and rotatingly guide the hinge pin relative to the single-piece member of the second link. The through-hole in one of the two parallel flanges comprises a flat portion cooperating with a flat section of the hinge pin so as to prevent the hinge pin from rotating relative to the single-piece member of the first link.

A device and method of observing mental condition of a user by interacting with an improved swatch of chain mail mesh that comprises interconnecting, polygonal plastic links suitably interconnected to define a sheet having each of the interconnecting, polygonal links having at least one degree of freedom of movement in at least one direction with respect to its neighbouring polygonal links wherein each of the interconnecting, polygonal links, interconnected to at least one neighbouring interconnecting polygonal link, combine to form an operative upper surface and an operative lower surface of the sheet, and wherein at least a portion of at least one of the operative upper surface and the operative lower surface of the sheet generally feels generally smooth with gaps, which produce a calming or pleasing effect when contacted with or moved over, or combinedly contacted with and moved over a human's body portion which being apt to sense of touch. The sheet has a predetermined drape coefficient, nonlinear motion, and is capable of providing relief in stress or pleasure when a human employs the same. The device is a fidget toy, and when used during observation a diagnosis and a therapy tool.

A chain mail mesh comprising interconnecting, polygonal links suitably interconnected to define a sheet having each of the interconnecting, polygonal links having at least one degree of freedom of movement in at least one direction with respect to its neighbouring polygonal links wherein each of the interconnecting, polygonal links, interconnected to at least one neighbouring interconnecting polygonal link, combine to form an operative upper surface and an operative lower surface of the sheet, and wherein at least a portion of at least one of the operative upper surface and the operative lower surface of the sheet generally feels smooth with gaps, which produce a calming or pleasing effect when contacted with or moved over, or combinedly contacted with and moved over a human's body portion which being apt to sense of touch. The sheet has a predetermined drape coefficient, nonlinear motion, and is capable of providing relief in stress or pleasure when a human employs the same.