I like to store old test pieces, even ones that didn't make it any further than trying an idea or playing to see what happens. "Playing" with materials is an important part of how I work and I like to look back on these test pieces after a period of time, weeks, months or years. Sometimes I surprise myself or I only notice connections in my thinking after time has elapsed.
I found some old test pieces from 2002-ish when I was focusing on wood with metals. It was good to see them again and feel the surfaces. Thought I would share them, so different from my work but I think there is a small connection in the feel of them.