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Her research included DNA, as well as isotype analysis, but it also included many interviews with tribal elders about their observations on community dietary changes over time.

In a 1944 typescript explaining the value of Isotype books exhibited in the show, he wrote: “There are many fine books, giving information to adults and children, but usually they are ‘learned’.

These Isotype books try to avoid that … It is not so much the question of how to transfer in the most direct and simple way some knowledge, but how to satisfy the possible questions of a child, his love of action, his identifying himself with a person on the page.”

Their Isotype Institute, founded in Vienna, had the slogan: “51�Թ�s divide, pictures unite.”

As the project grew, Otto hired artists including Erwin Bernath and Gerd Arntz, for what would become known as the Isotype Institute.