A walled boundary includes a frame, the frame comprising a base element extending horizontally; a transparent wall element mounted on the frame; and a wall support extending from the frame to the wall element. A modular court system includes a modular court; and a walled boundary adjacent to the modular court, the walled boundary comprising a first wall portion; a second wall portion adjacent to the first wall portion; and a first frame supporting the first wall portion in a vertical orientation.

A playing court apparatus for facilitating playing of a game having a base assembly configured to be disposed on any type of ground surface using a leveling foundation. The base assembly includes a plurality of base units that can be interconnected in a modular manner to support a playing surface. The base units are made from a variety of layers configured to improve the structural integrity of the playing surface and provide enhanced features. The playing surface is made from a plurality of surface panels modularly connected to each other. The surface panels are also made from a variety of layers to improve the functionality of the surface. The leveling foundation utilizes a plurality of legs to support the base units. For a complete, all encompassing playing court, the playing court can further have a netting system, a fencing system, and a lighting system.

A playing court apparatus for facilitating playing of a game having a base assembly configured to be disposed on any type of ground surface using a leveling foundation. The base assembly includes a plurality of base units that can be interconnected in a modular manner to support a playing surface. The base units are made from a variety of layers configured to improve the structural integrity of the playing surface and provide enhanced features. The playing surface is made from a plurality of surface panels modularly connected to each other. The surface panels are also made from a variety of layers to improve the functionality of the surface. The leveling foundation utilizes a plurality of legs to support the base units. For a complete, all encompassing playing court, the playing court can further have a netting system, a fencing system, and a lighting system.

A ring for a fighting sport has a circular fighting area defined by a plurality of circular fence rings that are held up by posts. Shock absorbers connect the fence rings to the posts. Position markers are provided to indicate the starting positions of the participating fighters at certain points during the bout.

A detachable deposition accessory for coupling to an autonomous deposition apparatus, and an autonomous deposition apparatus with reciprocal coupling, the detachable deposition accessory having: a locomotion arrangement; a deposition arrangement; a control unit, the control unit operable to receive at least one deposition instruction from the autonomous deposition apparatus; and a coupling capable of attaching the detachable deposition accessory to an autonomous deposition apparatus. Thus advantageously, there is provided the capability to quickly and easily change the abilities of the autonomous deposition machine for multiple different deposition application situations.

A ground printer for marking a ground surface, the ground printer comprising a print rack and being configured to travel in a first direction over the ground surface, the print rack comprising: a horizontal mounting rail positionally fixed to the ground printer and arranged in a second direction, substantially orthogonal to the first direction; and a vertical mounting rail arranged in a third direction, substantially orthogonal to the first direction and substantially orthogonal to the second direction, the vertical mounting rail being movably connected to the horizontal mounting rail; wherein a plurality of spray nozzles is mounted to the vertical mounting rail and aligned in a horizontal axis in the first direction.

A detachable deposition accessory for depositing a material on a ground surface, the wherein the detachable deposition accessory is operable to move in a first direction, the detachable deposition accessory comprising: locomotion means, the locomotion means mounted on a chassis; a deposition arrangement comprising one or more spray nozzles; a coupling capable of attaching the detachable deposition accessory to an autonomous mobile robot (AMR); and a deposition material cartridge mount, wherein the deposition material cartridge mount is operable to receive a removable paint cartridge at a first end and is fluidly coupled to the deposition arrangement at a second end. Thus advantageously, there is provided the means to quickly and easily change the abilities of the autonomous deposition machine attached to an AMR for multiple different deposition application situations.

A display device for showing a court line is provided. The court line is adapted to be shown on an indoor field. The display device includes field line sets disposed on a predetermined field. The field line sets have marker lines, and two or more of the marker lines overlap with each other. Each marker line includes a thin transparent body. The thin transparent body includes a protective film, a conductive layer, a light-emitting layer, an insulating layer, and an electrode layer. The light-emitting layer is made of a material including an electrochromic material. Each marker line in each field line set has an independent circuit loop. Thus, by energizing the light-emitting layer of the desired marker lines to make it emit light, the desired court lines will be shown correspondingly, thus avoiding the problem of causing users to be confused among multiple sets of court lines.

A coupling arrangement for a coupling a detachable deposition accessory to an autonomous mobile robot (AMR), the coupling arrangement comprising: a first portion, the first portion is configured to be removably coupled to the AMR, and is operable to be pivotable about the pitch axis only; a second portion, the second portion is fixedly attached to the AMR and is configured to retain the first portion and limit movement of the detachable deposition accessory in the yaw axis, when coupled to the AMR; and a support arm, wherein the support arm extends between the first and second portions. Thus advantageously, there is provided the means to quickly and easily change the abilities of the autonomous deposition machine attached to an AMR for multiple different deposition application situations.

The invention is a portable, foldable line demarcation system comprising line demarcation slats comprised of slat segments, hinging fixtures, and inter-slat attachment fixtures. The line demarcation slats are deployed such that they form side lines, back lines and interior lines compliant with sports authority play-area standards or rectangular-area standards describing allocated areas of use.