Presentation of reliefs 
An adequate presentation of reliefs is indispensable to increase their impression and to enhance their longevity. Especially plaster models are heavy and can not easily be removed, so they remain normally in a fixed position. Large scale models of high mountains should show their side-view to the viewer. So such models obtain a real great effect. If they slightly overtop the viewer, the silhouette of the mountain ridges is more impressive.
The effect of a terrain model strongly depends of the light direction and the type of the ambient light. Especially models of mountainous regions profit from direct transverse (not diffuse) light coming from one direction, preferably from top angular. The light may be artificial or natural daylight. This allows even subtle forms of the landscape to emerge. Not suitable is all-side diffuse light or light parallel to the line of sight. Different from this illumination are the conditions for relief photography. Here hard shadows should be avoid, thus diffuse transverse light may produce good results. The light intensity should be consistent over the whole relief. 
It is possible to change the colour and direction of the light. So one can study the influence of the light or the day time respectively on the shadow drop of mountains, or one can simulate for example the alpenglow, as demonstrated on Imfelds relief of the Jungfrau group at the World exhibition in Paris 1900 .
When the models are sheltered by glass, they are protected against dust and damage caused by visitors. But the visibility is often slightly constricted by glass barriers.