R<star>Trees seem like they might be an ideal data structure for writing a GUI, Window Manager, or the like... Related: https://en.wikipedia.org/wiki/Hilbert_

R<star>Trees seem like they might be an ideal data structure for writing a GUI, Window Manager, or the like... Related: https://en.wikipedia.org/wiki/Hilbert_R-tree https://en.wikipedia.org/wiki/Hilbert_R-tree R<star>Trees are a subcateory of Spatial Indices: https://en.wikipedia.org/wiki/Spatial_database#Spatial_index https://en.wikipedia.org/wiki/Spatial_database#Spatial_index