Counting.
To ∞, or, whatever.

seen from United States
seen from United Kingdom

seen from United States
seen from Switzerland
seen from United States
seen from United States
seen from China
seen from Switzerland
seen from Malaysia

seen from Switzerland
seen from United States
seen from Russia

seen from Germany

seen from Switzerland

seen from France
seen from United States

seen from United States
seen from United States
seen from Denmark

seen from Switzerland
Counting.
To ∞, or, whatever.
John Baez and James Dolan, From Finite Sets to Feynman Diagrams
an explosion of ideas
equality x=x is boring
why is 6÷2=3 ?