The book Unseen Networks of Heathrow Airport [iancarr.net] is accompanied by a small collection of simple data visualization posters that illustrate the noise levels at different locations in and around Heathrow airport buildings and boundaries. The "Spheres" poster portrays noise levels recorded at a Sound levels (dB) location in and around Heathrow Airport by colored circles. The "Matrix" visualization displays the link between each Sound levels (dB) location and the type of sound recorded over two minutes. In "Density", each column portrays noise levels and each line represents when the noise level reached above the average of 57 dB. The "Map" poster shows areas with a specific dB level at Heathrow Airport runway 1 and 2.