This is soft, rubbery cast of a pie that vibrates in different places to mimic me recalling π from memory.
A related work is Phone Calls, in which vibrating phones mimic one of my recitations of π.
This is a cymbal my father used as a drummer which he gave it to me when I started playing drums as a teenager. I was always rather hard on the cymbals, and one day when I was playing the bell of the cymbal broke off in one piece.
This was a collaboration in which formal experimentation was supplemented by the act of memorizing two paragraphs of a definition of "jug".