diff --git a/artefact/lib/artefact/cypher.ex b/artefact/lib/artefact/cypher.ex
index 740edbd..64a0459 100644
--- a/artefact/lib/artefact/cypher.ex
+++ b/artefact/lib/artefact/cypher.ex
@@ -153,8 +153,21 @@ defmodule Artefact.Cypher do
     "(#{id}#{label_str} #{prop_str})"
   end
 
-  defp effective_labels(labels, nil), do: labels
-  defp effective_labels(labels, base_label), do: Enum.uniq(labels ++ [base_label])
+  defp effective_labels(labels, nil), do: pascal_case(labels)
+  defp effective_labels(labels, base_label), do: pascal_case(Enum.uniq(labels ++ [base_label]))
+
+  defp pascal_case(labels) when is_list(labels) do
+    Enum.map(labels, &pascal_case(&1))
+  end
+
+  defp pascal_case(label) when is_binary(label) do
+    # split by spaces, captialise first letter only and join
+    String.split(label, " ") |> Enum.map_join(&capitalize_first(&1))
+  end
+
+  def capitalize_first(<<first::utf8, rest::binary>>) do
+    String.upcase(<<first::utf8>>) <> rest
+  end
 
   defp rel_pattern(%Artefact.Relationship{type: type, properties: props}) do
     prop_str = props_to_cypher(props)
diff --git a/artefact/test/artefact_test.exs b/artefact/test/artefact_test.exs
index a4ff4ad..64f151f 100644
--- a/artefact/test/artefact_test.exs
+++ b/artefact/test/artefact_test.exs
@@ -688,8 +688,8 @@ defmodule ArtefactTest do
       assert length(a.graph.nodes) == 8
     end
 
-    test "base_label is ArtefactHarmonise", %{artefact: a} do
-      assert a.base_label == "ArtefactHarmonise"
+    test "base_label is Artefact Harmonise", %{artefact: a} do
+      assert a.base_label == "Artefact Harmonise"
     end
 
     test "has compose, harmonise, Binding, guards and outcomes", %{artefact: a} do
diff --git a/artefact/test/data/artefact_harmonise/arrows.json b/artefact/test/data/artefact_harmonise/arrows.json
index 7876502..8e0aa54 100644
--- a/artefact/test/data/artefact_harmonise/arrows.json
+++ b/artefact/test/data/artefact_harmonise/arrows.json
@@ -1 +1 @@
-{"base_label":"ArtefactHarmonise","nodes":[{"caption":"","id":"n0","labels":["Operation","ArtefactHarmonise"],"position":{"x":-300,"y":-150},"properties":{"meaning":"Disjoint union; nodes reindexed to avoid id collision","name":"compose","uuid":"019da93e-ef0c-774e-b2f5-385d9da61db9"},"style":{}},{"caption":"","id":"n1","labels":["Operation","ArtefactHarmonise"],"position":{"x":300,"y":-150},"properties":{"meaning":"Merge bound nodes; lower uuid wins identity, labels unioned, left-wins properties","name":"harmonise","uuid":"019da93e-ef0c-7f46-bcc5-34b814ba0a3b"},"style":{}},{"caption":"","id":"n2","labels":["Mechanism","ArtefactHarmonise"],"position":{"x":600,"y":-150},"properties":{"meaning":"Declares node equivalence; auto-detected by shared uuid or injected explicitly","name":"Binding","uuid":"019da93e-ef0c-7f50-a41b-c37bef7a232d"},"style":{}},{"caption":"","id":"n3","labels":["Outcome","ArtefactHarmonise"],"position":{"x":-300,"y":150},"properties":{"meaning":"Graphs side by side; label-based implicit relationships","name":"Disjoint","uuid":"019da93e-ef0c-7257-b962-6b8a46a8e712"},"style":{}},{"caption":"","id":"n4","labels":["Outcome","ArtefactHarmonise"],"position":{"x":300,"y":150},"properties":{"meaning":"Bound nodes fused; relationships deduplicated by from/type/to, left-wins properties","name":"Merged","uuid":"019da93e-ef0c-75ed-95d2-e805513d2b7d"},"style":{}},{"caption":"","id":"n5","labels":["Guard","ArtefactHarmonise"],"position":{"x":0,"y":350},"properties":{"meaning":"Artefact cannot be harmonised with itself","name":"SameUUID","uuid":"019da93e-ef0c-7cda-90d3-e34bf1541ddb"},"style":{}},{"caption":"","id":"n6","labels":["Guard","ArtefactHarmonise"],"position":{"x":600,"y":150},"properties":{"meaning":"Artefacts from the same base_label family cannot be harmonised","name":"SameBaseLabel","uuid":"019da93e-ef0c-733d-9971-662b0d380c11"},"style":{}},{"caption":"","id":"n7","labels":["Struct","ArtefactHarmonise"],"position":{"x":0,"y":-350},"properties":{"name":"Artefact","uuid":"019da897-f2e0-74b2-ab91-4d68115d4f71"},"style":{}}],"relationships":[{"fromId":"n7","id":"r0","properties":{},"style":{},"toId":"n0","type":"HAS_OPERATION"},{"fromId":"n7","id":"r1","properties":{},"style":{},"toId":"n1","type":"HAS_OPERATION"},{"fromId":"n1","id":"r2","properties":{},"style":{},"toId":"n2","type":"REQUIRES"},{"fromId":"n0","id":"r3","properties":{},"style":{},"toId":"n3","type":"PRODUCES"},{"fromId":"n1","id":"r4","properties":{},"style":{},"toId":"n4","type":"PRODUCES"},{"fromId":"n1","id":"r5","properties":{},"style":{},"toId":"n5","type":"RAISES_ON"},{"fromId":"n1","id":"r6","properties":{},"style":{},"toId":"n6","type":"RAISES_ON"}],"style":{},"title":"ArtefactHarmonise","uuid":"019da93f-1f64-744c-aefa-4ecbf75358c3"}
+{"base_label":"Artefact Harmonise","nodes":[{"caption":"","id":"n0","labels":["Operation","Artefact Harmonise"],"position":{"x":-300,"y":-150},"properties":{"meaning":"Disjoint union; nodes reindexed to avoid id collision","name":"compose","uuid":"019da93e-ef0c-774e-b2f5-385d9da61db9"},"style":{}},{"caption":"","id":"n1","labels":["Operation","Artefact Harmonise"],"position":{"x":300,"y":-150},"properties":{"meaning":"Merge bound nodes; lower uuid wins identity, labels unioned, left-wins properties","name":"harmonise","uuid":"019da93e-ef0c-7f46-bcc5-34b814ba0a3b"},"style":{}},{"caption":"","id":"n2","labels":["Mechanism","Artefact Harmonise"],"position":{"x":600,"y":-150},"properties":{"meaning":"Declares node equivalence; auto-detected by shared uuid or injected explicitly","name":"Binding","uuid":"019da93e-ef0c-7f50-a41b-c37bef7a232d"},"style":{}},{"caption":"","id":"n3","labels":["Outcome","Artefact Harmonise"],"position":{"x":-300,"y":150},"properties":{"meaning":"Graphs side by side; label-based implicit relationships","name":"Disjoint","uuid":"019da93e-ef0c-7257-b962-6b8a46a8e712"},"style":{}},{"caption":"","id":"n4","labels":["Outcome","Artefact Harmonise"],"position":{"x":300,"y":150},"properties":{"meaning":"Bound nodes fused; relationships deduplicated by from/type/to, left-wins properties","name":"Merged","uuid":"019da93e-ef0c-75ed-95d2-e805513d2b7d"},"style":{}},{"caption":"","id":"n5","labels":["Guard","Artefact Harmonise"],"position":{"x":0,"y":350},"properties":{"meaning":"Artefact cannot be harmonised with itself","name":"SameUUID","uuid":"019da93e-ef0c-7cda-90d3-e34bf1541ddb"},"style":{}},{"caption":"","id":"n6","labels":["Guard","Artefact Harmonise"],"position":{"x":600,"y":150},"properties":{"meaning":"Artefacts from the same base_label family cannot be harmonised","name":"SameBaseLabel","uuid":"019da93e-ef0c-733d-9971-662b0d380c11"},"style":{}},{"caption":"","id":"n7","labels":["Struct","Artefact Harmonise"],"position":{"x":0,"y":-350},"properties":{"name":"Artefact","uuid":"019da897-f2e0-74b2-ab91-4d68115d4f71"},"style":{}}],"relationships":[{"fromId":"n7","id":"r0","properties":{},"style":{},"toId":"n0","type":"HAS_OPERATION"},{"fromId":"n7","id":"r1","properties":{},"style":{},"toId":"n1","type":"HAS_OPERATION"},{"fromId":"n1","id":"r2","properties":{},"style":{},"toId":"n2","type":"REQUIRES"},{"fromId":"n0","id":"r3","properties":{},"style":{},"toId":"n3","type":"PRODUCES"},{"fromId":"n1","id":"r4","properties":{},"style":{},"toId":"n4","type":"PRODUCES"},{"fromId":"n1","id":"r5","properties":{},"style":{},"toId":"n5","type":"RAISES_ON"},{"fromId":"n1","id":"r6","properties":{},"style":{},"toId":"n6","type":"RAISES_ON"}],"style":{},"title":"Artefact Harmonise","uuid":"019da93f-1f64-744c-aefa-4ecbf75358c3"}