Update README.md

dartclub · Mar 24, 2022 · 4f49a28 · 4f49a28
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@@ -10,6 +10,9 @@ This includes a fully [RFC 7946](https://tools.ietf.org/html/rfc7946)-compliant
 
 Most of the implementation is a direct translation from [turf.js](https://github.com/Turfjs/turf).
 
+## GeoJSON Object Model
+
+![polymorphism](https://user-images.githubusercontent.com/10634693/159876354-f9da2f37-02b3-4546-b32a-c0f82c372272.png)
 
 ## Notable Design Decisions
 - Nested `GeometryCollections` (as described in