Images suspended on layers of glass or transparent plastic sheet to represent three-dimensional objects or landscapes.
Glass Relief, p.61, Terrain Models and Relief Map Making, Technical manual TM 5-249, Washington 1956
Progress, 2006 - David Spriggs
Axis of Power, 2009 - David Spriggs (installation in progress)
Layer Drawing, Aomori Forest, 2010 - Nobuhiro Nakanishi
Sources and further information
That Last Landscape 