Each photo filter corresponds to a different moment in time and the related Threat Level from that period.
Post photos from the Fear Filter mobile app. Tag, comment and caption photos.
The UK Terror Threat Level is set by the uk government and the UK intelligence agencies. Since 2006 there are 5 levels of threat: Critical, Severe, Substantial, Moderate and Low.
Fear filter is a collaborative artwork. Post photos from the app to have them included in exhibitions and the online photo stream at http://www.fearfilter.uk/