Update README.md

Author: abhishekraok

README.md

@@ -4,11 +4,11 @@
 GraphMap is a way to organize image in a spatial 2D layout.
 It is a directed cyclic graph where every node has either 0 or 4 edges. 
 Each node may or may not have an image on them. 
-One can imagine this as a quad tree, and you are looking from the top. 
-Except that any image from the child takes higher priority than parent.
+One can imagine this as a quad tree (although cycles are possible), and you are looking from the bottom. 
+Each child gets a quadrant. If a child has an image it covers the parent image in that quadrant.
 If a node doesn't have an image it is invisible. 
 
-![Graph Map structure](https://artmapstore.blob.core.windows.net/firstnodes/photos/node_image.png)
+![Graph Map structure](https://artmapstore.blob.core.windows.net/firstnodes/photos/node_image2.png)
 
 ### Features
 - The created graph is immutable. New nodes can be added but old ones cannot be modified.
@@ -41,6 +41,4 @@ Follow up with other notebooks in the [notebook section](./notebook/)
 - Inspired by my [blog article](http://blog.abhishekrao.org/2013/11/multi-level-attack.html)
 - XKCD comic on deep zoom [xkdcd1110](http://dump.ventero.de/xkcd1110/open.html) 
 - The graph created by the API is [Persistent Immutable DataStructure](https://en.wikipedia.org/wiki/Persistent_data_structure). The ideas used are similar to the ones explaine in this video [Immutable JS](http://facebook.github.io/immutable-js/)
-
-#### Links
 - [Deep zoom links (Quora)](https://www.quora.com/What-is-Seadragon-used-for-and-how-does-it-work-in-really-simple-laymen-terms) What is OpenSeadragon