Interior signs serve to show us the way (wayfinding or directory signs).
Interior signs also show us the Brand and they serve to show us the offer or deal. Using signs at the point of purchase as part of the interior decor combining art and product placement not only increases impulse sales but improves brand awareness and can create a more pleasing customer experience. This works especially well in fast moving environments like fast food, convenience stores and gas stations.However with a little refinement this approach can and does work well in any retail environment.
If you have been to any shopping mall lately you have no doubt seen the beautiful sports model perhaps without noticing at least consciously the prominent product placement. In the old days this was more subtle but today it is right out front and very effective. Some other examples of interior signs are shown below.