The Walking Arch
The walking arch is made of four legs, each one half of an arch or a quarter of a circle. It folds up to contract to less than a third of its original size. At the end of each leg is a claw-like foot that is used for walking or grabbing on to objects and surfaces while moving on uneven terrain or climbing obstacles. Like the moving arch, the walking arch is a static-type system, with its axis point of rotation remaining fixed. Each of the legs of the walking arch is hinged at the halfway point allowing it to walk. When the component is fully extended and in the form of an arch, the 'knee' hinges lock. Each half of the leg is able to extend and contract independently when they are not locked together. This is possible due to the two parallel sliding bars attached to opposite levers of the system at both ends of each half leg.
The four legs are all connected together at the top of the arch by a hinge attached to individual rotational mechanism. Each leg is therefore able to rotate around 90 degrees as well as up and down 180 degrees, all independently of each other. When the walking arch is fully expanded into and arch, the hinges are oriented directly downward. Like with the midway hinge, this hinge also has the two parallel sliding bars attached to opposite levers of the system allowing it to expand and contract in conjunction with the hinge at the midway section.
The Geodesic Dome Segment
The dome segment component is a large scale portion of a geodesic dome made using Chuck Hoberman's system. The dome segments, like the moving arch, have a flexible video display fabric attached to the connection points. When the dome is fully expanded the fabric is stretched taught. When compacted, it would fold up inside the gaps in the levers. The base used for the moving arch is also used for the dome segment. One of the dome segment's greatest features is its ability to start out small, condensed, and unobtrusive and then expand into a large enclosing surface for performances to take place in. Compressed, they can be positioned on the edges of the larger perimeter circle that they will expand to, so that when they do, they expand inward eventually touching and creating a continuous domed surface. Alternatively multiple segments could be connected together when compressed and expand together forming a continuous domed surface for a performance to take place in.
By attaching the dome segments to the bottom of the central portion of the walking arch, the dome segments are able to be easily and rapidly transported and deployed. Once the walking arch has moved the dome segments in to place, it expands to a complete arch, with its legs at 90 degree angles from one another. The dome then expands downward from the central point at the top of the arch, creating a performance enclosure. This could take place in a matter of minutes, creating a surprise performance attack on public spaces, 'trapping' spectators within the space. Once the dome segments are fully extended, the walking arch's legs can contract back upwards out of the way. They can also move in and out of the domed enclosure, carrying out other function as part of the performance.