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diff --git a/src/datatypes.ads b/src/datatypes.ads
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+
+with
+
+    Ada.Numerics.Generic_Complex_Types,
+    Ada.Containers.Vectors;
+
+package Datatypes is
+
+    type Quantity is digits 18;
+
+    package Plane is new Ada.Numerics.Generic_Complex_Types (Real => Quantity);
+
+    type Particle is record
+        Place        : Plane.Complex;
+        Solid        : Boolean;
+        Density      : Quantity := 0.0;
+        Acceleration : Plane.Complex := Plane.Compose_From_Cartesian (0.0, 0.0);
+        Velocity     : Plane.Complex := Plane.Compose_From_Cartesian (0.0, 0.0);
+    end record;
+
+    function Create
+           (X, Y  : in Quantity;
+            Solid : in Boolean)
+        return Particle;
+
+    package Particle_Vectors is new Ada.Containers.Vectors
+       (Index_Type   => Positive,
+        Element_Type => Particle);
+
+    subtype Particle_Vector is Particle_Vectors.Vector;
+
+end Datatypes;
+