diff --git a/smocore/include/artificedMentalExistent.h b/smocore/include/artificedMentalExistent.h
new file mode 100644
index 0000000..d3f980a
--- /dev/null
+++ b/smocore/include/artificedMentalExistent.h
@@ -0,0 +1,31 @@
+#ifndef _ARTIFICED_MENTAL_EXISTENT_H
+#define _ARTIFICED_MENTAL_EXISTENT_H
+
+#include "mentalExistent.h"
+
+namespace smo {
+
+class FogArtificedMentalExistent
+: public ArtificedMentalExistent
+{
+};
+
+typedef FogArtificedMentalExistent Fogaxent, FogArtixent;
+
+class IdyllicArtificedMentalExistent
+: public ArtificedMentalExistent
+{
+};
+
+typedef IdyllicArtificedMentalExistent Idyllixent, IdyllArtixent;
+
+class FantasyArtificedMentalExistent
+: public ArtificedMentalExistent
+{
+};
+
+typedef FantasyArtificedMentalExistent Fantaxent, FanArtixent;
+
+} // namespace smo
+
+#endif
diff --git a/smocore/include/fantasyArtificedMentalExistent.h b/smocore/include/fantasyArtificedMentalExistent.h
new file mode 100644
index 0000000..4267cc5
--- /dev/null
+++ b/smocore/include/fantasyArtificedMentalExistent.h
@@ -0,0 +1,24 @@
+#ifndef _FANTASY_ARTIFICED_MENTAL_EXISTENT_H
+#define _FANTASY_ARTIFICED_MENTAL_EXISTENT_H
+
+#include "artificedMentalExistent.h"
+
+namespace smo {
+
+class FictionalFantasyArtificedMentalExistent
+: public FantasyArtificedMentalExistent
+{
+};
+
+typedef FictionalFantasyArtificedMentalExistent Fictaxent, FictFantixent;
+
+class AspirationFantasyArtificedMentalExistent
+: public FantasyArtificedMentalExistent
+{
+};
+
+typedef AspirationFantasyArtificedMentalExistent Aspixent, AsFantixent;
+
+} // namespace smo
+
+#endif
diff --git a/smocore/include/mentalEntity.h b/smocore/include/mentalEntity.h
index 7f0762a..823f5d4 100644
--- a/smocore/include/mentalEntity.h
+++ b/smocore/include/mentalEntity.h
@@ -3,10 +3,24 @@
 
 namespace smo {
 
+/*
+ * MentalEntities refer to all mental content that needs to be persistently
+ * stored to represent cognitive and personna state. This includes such things
+ * as value judgements, comparators, logical ops, DB links, etc.
+ *
+ * Mental Existents are a narrower subset of MentalEntities that represent
+ * implicit existents and perceptual data, both implexed and artificed.
+ */
 class MentalEntity
 {
 public:
     using Id = uint32_t;
+
+public:
+    MentalEntity(const Id id) : id(id) {}
+
+public:
+    const Id id;
 };
 
 } // namespace smo
diff --git a/smocore/include/mentalExistent.h b/smocore/include/mentalExistent.h
new file mode 100644
index 0000000..af8d5a6
--- /dev/null
+++ b/smocore/include/mentalExistent.h
@@ -0,0 +1,37 @@
+#ifndef _MENTAL_EXISTENT_H
+#define _MENTAL_EXISTENT_H
+
+#include "mentalEntity.h"
+
+namespace smo {
+
+/*
+ * MentalExistents are content of the mind that specifically represents
+ * existents. I.e: perceptual data, whether structural or implicative. All
+ * Mentexents are Mentities, but not all Mentities are Mentexents.
+ */
+
+class MentalExistent
+: public MentalEntity
+{
+};
+
+typedef MentalExistent Mentexent;
+
+class ImplexedMentalExistent
+: public MentalExistent
+{
+};
+
+typedef ImplexedMentalExistent Implexent;
+
+class ArtificedMentalExistent
+: public MentalExistent
+{
+};
+
+typedef ArtificedMentalExistent Artifixent, Artixent;
+
+} // namespace smo
+
+#endif