A chair including a swivel assembly. The chair can include three or more arms pivotally connected to the swivel assembly and selectively moveable between an open position and closed position. The chair can also an arm lock disposed on top of the swivel assembly, where the arm lock is selectively moveable between a locked position and unlocked position. The chair can also include a seat removably connected to a distal end of each arm.

A chair including a swivel assembly. The chair can include three or more arms pivotally connected to the swivel assembly and selectively moveable between an open position and closed position. The chair can also an arm lock disposed on top of the swivel assembly, where the arm lock is selectively moveable between a locked position and unlocked position. The chair can also include a seat removably connected to a distal end of each arm.

A tension-compression base structure including tension elements (such as flexible cables or ropes) and compression elements (such as rigid legs) is provided with a slidably adjustable path for the tension elements around or within the compression elements, thereby enabling a degree of adaptability to support surfaces that may not be ideally flat, such as on outdoor terrain. Such a tension-compression base may be used to support a platform, a stool, or an item of equipment that may be desirably held in a preferred orientation irrespective of terrain irregularities, and as furniture may be configured to rock with a user's body as a form of active seating.

A tension-compression base structure including tension elements (such as flexible cables or ropes) and compression elements (such as rigid legs) is provided with a slidably adjustable path for the tension elements around or within the compression elements, thereby enabling a degree of adaptability to support surfaces that may not be ideally flat, such as on outdoor terrain. Such a tension-compression base may be used to support a platform, a stool, or an item of equipment that may be desirably held in a preferred orientation irrespective of terrain irregularities, and as furniture may be configured to rock with a user's body as a form of active seating.