Pretty awesome poster…

Principal subjects of science appear in this poster as geological strata.  Psychology rests atop biology because—as far as we know—psychological events are a special class of biological events.  So, psychology is “grounded” in biology.  Biology, in turn, is grounded in chemistry.  And chemistry is grounded in physics.  Finally, all these branches of science rest on the deepest stratum, philosophy.  Each major subject reveals three substrata that describe “structures” of differing scale, large to small.  Each such structure refers laterally to a crucial scientific theory that underlies our understanding of the universe at that level.

Source: http://wonderfest.org/