psychologist Dan Ariely in his work Predictably Irrational explains that social norms shape people's decisions as much as market norms. Therefore, individuals tend to be willing to create value because of their social constructs, knowing that they won't be paid for that. He draws an example of a thanksgiving dinner: offering to pay would likely offend the family member who prepared the dinner as they were motivated by the pleasure of treating family members. Similarly, commons-based projects, as claimed by Yochai Benkler, are the results of individuals acting "out of social and psychological motivations to do something interesting". He goes on describing the wide range of reasons as pleasure, socially and psychologically rewarding experiences, to the economic calculation of possible monetary rewards (not necessarily from the project itself). On the other hand, the need for collaboration and interaction lies at the very core of human nature and turns out to be a very essential feature for one's survival. Enhanced with digital technologies, allowing easier and faster collaboration which was not as noticeable before, it resulted in a new social, cultural and economic trend named collaborative society. This theory outlines further reasons for individuals to participate in peer production such as collaboration with strangers, building or integrating into a community or contributing to a general good. Examples Examples of projects using commons-based peer production include: Linux, a computer operating system kernel GNU, a computer operating system generally used in conjunction with the kernel Linux LibreOffice, an office suite for computer desktops, mobiles and cloud collaboration Slashdot, a news and announcements website Wikipedia, an open-collaborative online encyclopedia Distributed Proofreaders, which proof reads public domain e-texts for publication on Project Gutenberg SETI@home, a volunteer computational project which searches for extra terrestrial life Kuro5hin, a discussion site for technology and culture Clickworkers, a citizen science program SourceForge, a software development organization Sensorica, a hardware development network-organization using the open value network model. RepRap Project, a project to create an open-source self-copying 3D printer. Pirate Bay, a shared index of bittorrents (under legal scrutiny in Sweden as of February 2009) OpenStreetMap, a collaborative free map of the world. Wikiprogress, a project for collecting information and data on measuring the progress of societies. Ushahidi, activist mapping. Open Source Ecology, a project for designing and building open source industrial machines, fabricated by eXtreme Manufacturing. GROWL, a degrowth education network producing open materials and curricula. Community Garden, where