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Screenshot of Original 1984 Macintosh desktop. Courtesy of Wikipedia.org. Uploaded by Tene as Image:Apple_Macintosh_Desktop.png. Copyright by Microsoft. Link: https://en.wikipedia.org/wiki/File:Apple_Macintosh_Desktop.png

Screenshot of The Blaster Learning System. Copyright by Knowledge Adventure. Courtesy of http://gamefabrique.com/ Link: http://gamefabrique.com/storage/screenshots/genesis/math-blaster-episode-1-02.png

Illustration of the history of desktop interaction. Courtesy of pibook.gr License: Attribution-NonCommercial-ShareAlike 2.0

Screenshot of Balsamiq Mockups. Copyright by Balsamiq. Image: "iPhone POI editor - screen 4" by Martijn van Exel. Via flickr.com. License: Attribution-ShareAlike 2.0 Generic (CC BY-SA 2.0) Link: https://flic.kr/p/6HHDTq

Gerrit Rietveld - Schröder House Physical Model. Image: Gavin Schaefer. Via www.flickr.com. License: Attribution 2.0 Generic (CC BY 2.0) Link:https://flic.kr/p/7x4tsb

Logos of gmail-beta in 2005 and 2007. Via www.wikia.com. License:(CC BY-SA) Link: http://logos.wikia.com/wiki/Gmail

"Desktop Ubuntu 13 10" by Funkruf - Aufgenommen von mein PC "Funkruf". Licensed under CC BY-SA 3.0 via Wikimedia Commons - https://commons.wikimedia.org/wiki/File:Desktop_Ubuntu_13_10.png#/media/File:Desktop_Ubuntu_13_10.png

Uber promo by Amirul Azam. Via www.flickr.com. License: Attribution-NonCommercial-NoDerivs 2.0 Generic (CC BY-NC-ND 2.0) Link: https://flic.kr/p/jyCPMu and "Paso 2 - Pedir un vehículo" by acanyi. Via www.flickr.com. License:Attribution-ShareAlike 2.0 Generic (CC BY-SA 2.0) Link:https://flic.kr/p/n4hvFv

Screenshot of Minecraft project. View of our 2nd Generation Minecraft House. Courtesy of flickr.com. Image: Wesley Fryer. Uploaded on April 28, 2014. Attribution 2.0 Generic (CC BY 2.0). Link :https://flic.kr/p/nn3aB3

Screenshot from video "Grace Plays LearnToMod: Part 3". Published on October 25, 2014. Courtesy of youtube.com. License: Standard YouTube License. Link: https://www.youtube.com/watch?v=vD6owwGfkVg

Illustration of xerox star genealogy. Based on Bushy Tree (2002). http://c2.com/cgi/wiki?BushyTreeDiagram. This file is in the public domain.

The Xerox Star 8010 "Dandelion". Courtesy of digibarn.com. Creative Commons Attribution-Noncommercial 3.0 License. Link:http://www.digibarn.com/collections/systems/xerox-8010/xerox-star-8010-large.jpg

Bill English with the oNLine System (NLS); late 1960s. Image: Courtesy of SRI International and Computer History Museum. Link: http://www.computerhistory.org/atchm/wp-content/uploads/2013/07/English-ergo-setup-500004647-03-01.jpg