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Rubens Henry IV. Digital image. Wikipedia. N.p., n.d. Web. 14 Nov. 2015.
Why might some people consider this cycle of paintings to be the work of Rubens' assistants rather than the artist's himself?
Assistants created the canvases and worked up the majority of the paint layers.
The final layer of paint was done by assistants.
The oil sketches for them were created by assistants.
Only the oil sketches were created by Rubens.