SO, I noticed this morning when I opened a new toothpaste tube box, that
one of the dimensions of the box looked to be close to 35mm film size.
Sure enough, the inside dimension was ~36mm, just right for a strip of
35mm film (which happens to be 35mm wide and a good reason we call it
35mm film, even though the size inside the sprocket holes is 24mm).

You know what came next. Make a pinhole in the center of one side, cut a strip
of Acros 100 to 8" in length, fix it inside the box, expose for 30 seconds,
and at first try an image appears. Curiosity satisfied. :-)

Better than a matchbox, I think. I like the wide angle. May be worth doing this carefully !!

Of course, I neglected E=I/r2

To save you looking for a dictionary, here's the definition of what you're thinking right now .... LOL

eccentric [ɪkˈsɛntrɪk]
adj
1. deviating or departing from convention, esp in a bizarre manner; irregular or odd
2. (Mathematics) situated away from the centre or the axis
3. (Mathematics) not having a common centre eccentric circles Compare concentric
4. not precisely circular
n
1. a person who deviates from normal forms of behaviour esp in a bizarre manner
2. (Engineering / Mechanical Engineering) a device for converting rotary motion to reciprocating motion
[from Medieval Latin eccentricus, from Greek ekkentros out of centre, from ek- ex-1 + kentron centre]