What turned me on to mathematics
The Joy of Six
Mathematical Phantoms
Ptolemy and non-Archimedes
The closed subgroup theorem
The Isbell, Kriz, Pultr, Rosicky theorem (sorry, no accents) that a localic subgroup of a localic group is closed.
Peripatetic Seminar on Sheaves and Logic 1976-1999
Argument in 1 and 2 dimensions
Argument in 1 and 2 dimensions
Some algebra-lite inspired by an amusing talk If time were 2-dimensional to an undergraduate mathematics society by Christopher Zeeman in 1957 or thenabout.

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