Why the painting La Corde Sensible is looking like the fireball of nuclear test Dominick Housatonic?

La Corde Sensible, Renè Matisse, 1960

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Dominick Housatonic, 1962

Wikipedia (1)

Why the painting La Corde Sensible is looking like the fireball of nuclear test Dominick Housatonic?

Is this a coincidence? Above is the painting La Corde Sensible, which is painted by René Matisse in 1960. The image below is portraying the nuclear test Dominic Housatonic or sharper saying it portrays the fireball of that nuclear test from the year 1962. The 8,3 megaton test was made on 30 October 1962, and it was one of the last atmospheric tests in the atmosphere. 

But the fact is that Matisse couldn't see that fireball himself during the Le Corde Sensible was under work because the Housatonic test was made two years after his painting was completed. You can see the similarity of the fireball and painting yourself. 

(1) https://en.wikipedia.org/wiki/Operation_Dominic