The first picture was taken at the Joint Math Meetings in January 2015, by Goen South.

The next picture was taken at MIT in May 2011, by Bryce Vickmark.

The next was taken by C. J. Mozzochi at Columbia in December 2007.

The next was taken by Donna Coveney for MIT's house organ Tech Talk in the spring of 1999.

The next is the work of Tony Chiang and his Amazing Digital Camera.

Finally, one through the professional lens of George Delianides.

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