Collecting pieces around something I call “green window project”.
Moving into a very small flat in Tokyo, with no good view outside? Ideas of using computer screens to replace windows are coming up. Most interesting is to collect content: waterfalls, nature and so on, free content. Kickstarter projects are also around: https://www.kickstarter.com/projects/atmoph/atmoph-window-your-room-can-be-anywhere .
Should a monitor or TV be used?
Many settings of a TV are not appropriate here. Example: Samsung UE40HU6900S
The bigger the better, but..
Bringing audio, video or pictures to the TV/monitor
The content should be free.
Many computers like the thinkpad x230 here still have displayport 1.1a or other output which does not provide 4k resolution.