eng Science and Education Publishing International Journal of Physics 2333-4576 2015-02-09 3 2 69 73 10.12691/ijp-3-2-4 IJP2015324 article Arne Bergstrom arne.bergstrom@physics.org 1 B&E Scientific Ltd, BN25 4PA, United Kingdom The properties of hallway switches are discussed with emphasis on how special types of such switch systems with arbitrarily many switches can be constructed and systematically become conducting/nonconducting by simply turning on/off any arbitrary switch in the system, and then become nonconducting/conducting again by turning off/on any arbitrary switch in the system, etc. A question is whether in physics, biology, genetics, economics, sociology, or traffic management, there might exist - or preferably would exist - complex such systems, the global state of which could thus be switched by a local action anywhere in the system and then switched back by another local action anywhere in the system. http://pubs.sciepub.com/ijp/3/2/4/ijp-3-2-4.pdf arbitrarily large switch systems on/off activation at arbitrary switch applications searched