A general audience paper on Lesniewski's Mereology

This material is intended for a general audience. The paper is  forthcoming in European Review (special issue on Logic and Philosophy in Poland). I would like to express my gratitude to Dagfinn Follesdal for his comments.

It's not going to be terribly surprising if phil of math is your thing, but for an exposition it's almost bearable (he said proudly).

Also, p. 7 par. 5 from the bottom and fn. 13 give you an example of what logician's revenge looks like (and how harmless it is).

[EDIT: Thanks to Paweł Pawłowski for his correction.]
[EDIT 2: Thanks to Jack MacIntosh (this one, not this one) for his comments and a pointer to Lowe's paper.]