Transparent paper for sketches and overlays it states. For me, tracing maps, and land surveys, and the like, would help get around some of those "geographic" brick walls. The following are some examples.
Understanding migration patterns helped break down a couple of my brick walls. The 1850 census records in Kentucky [where my family has lived since 1776] would give a state of birth such as PA, VA, NC, etc. How they got here was often a question that had to be answered before that brick wall could be faced. Lots of color, lots of tracing, came into play. Tracing paper was the foundation of these adventures.