First figure: a proton (left) has quark constituents: two up quarks
(red circle) and one down quark (blue). In a nucleus, such as a helium
nucleus (right), protons and neutrons (two down quarks and one up quark)
can be kneaded from its quiescent shape (dark gray) into a more stretched
out shape (light gray).
Second figure: An alternative graphical rendering of "kneaded"
Reported by: Strauch et al., Physical Review Letters
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