The invisible magnetic intrusion of transmissions is a reality that surrounds us so much, what actually manifests itself only in the illuminated screens of phones, PDAs and laptops, leaving more to the indifference of something that is not seen. Instead make evident the presence of tools that claim to provide protection, but that flow easily into the control is a practice that tends to increase the collective consciousness, exposing the constant presence of electromagnetic waves or optical sensors in our surroundings. Digital Kit Shelter is one projects Pedro Sepulveda, artist particularly dedicated to the relationship between architecture and electronic technologies in urban spaces. This 'kit' consists of a roll of duct tape on the type of emergency used by law enforcement, with out the warning: 'digital shelter – stand inside the line', a Waveshield mobile phone jammer, ie a device capable of prevent cell phone communications through the issuance of a radio frequency and a fake surveillance camera. Inspired by the 'safety zone' of the New York metropolitan area (a small space on the dock waiting area where it is monitored by surveillance cameras, with agents (only theoretically) ready to intervene in case of need), the set instigates performance of materials to improvise within a public space, delimiting an area with tape stuck to the ground and placing the phone jammer to cover the same area 'watched' by the surveillance camera. The type of mobile communication inevitably recalls the memory Wi-Fi Hog Jonah Brucker-Cohen, who played with such paradoxes, but here the interaction is more structural, intended to quickly build a space that reveal the real in all its levels. The thin yellow line built with a mark of attention outlines public (even symbolically) the boundary between public and private, ever so ethereal as in the current contemporary.