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Partitions rectangles into hierarchical components with area proportional to value.
Chart
Hierarchy
Composition
What it answers
Which hierarchical components occupy the largest share?
Shape
Nested rectangles
What it shows
Dominant branches and nested composition.
Example: Raket Parts B.V.
The question
Where do Raket Parts’ 400 people work?
Raket Parts people by unit, 2025
Raket Parts, 400 people. Operations (purple): machining 130; assembly and clean room 70; warehouse and logistics 31; quality 22; maintenance 14; purchasing 14; production planning 9. Engineering (pink) 42. Sales and customer service (cyan) 31. Support (light cyan): finance and control 18; HR 7; IT 6; ERP project team 6.
Raket Parts B.V. is a fictional company created for Insyt.
The misleading version
Same question, drawn badly
A treemap for three close values
Station outages 512, scheduling conflicts 388, interference and weather 171 (the other 89 missed passes are left out).
What goes wrong. Rectangles of different shapes are hard to compare. A bar chart shows the gap between 512 and 388 at once. This version also drops the 89 other misses.
When to use it
Use it when
Large nonnegative hierarchies with size overview.
Avoid it when
Precise cross-level comparison or negative measures.
How to read it
Read rectangle containment, then compare areas within the same level.
