This would make use of the Raspberry Pi’s internet connection. When tweets are sent to a particular account or using a particular hashtag, they would be picked up, and assigned a colour based upon the time of day that they were sent, and then placed upon a virtual canvas, the distance from the centre being based upon the length of the tweet, which is obviously limited to 140 characters. This then is projected onto a blank wall for people to look at. As the tweets build up however, they will overlap and create interesting patterns and colour combinations. In order for visitors to see what they have tweeted, the last tweet is always on the top,
The Raspberry Pi would be useful for this, as it is small and can easily be hidden away whilst still functioning and providing the computing power to process the information and images.