Light-free reflectives?

Discussion in 'Technical Chat' started by Danny Colyer, Nov 22, 2010.

  1. Danny Colyer

    Danny Colyer Guest

    Short conversation that I had with a colleague as I was leaving work
    this evening:

    LW: You don't wear any reflective stuff, then.
    DC (indicating ribs on Foska Bones jacket): These are all reflective.
    LW: Yeah, but only when there's a light on them.
    DC: Er, I think you'll find that's true for most reflectives.

    Danny Colyer, Nov 22, 2010
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  2. Danny Colyer

    Clive George Guest


    But I wonder if there could be light equivalents to semiconductors - a
    material which only becomes reflective when a certain light is shone on it.
    Clive George, Nov 22, 2010
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  3. Danny Colyer

    Andy Morris Guest

    Better still a Heisenberg reflective, that is only reflective when no
    light is shining on it.
    Andy Morris, Nov 23, 2010
  4. Danny Colyer

    Ace Guest

    Only when there's no-one _looking_ at it, surely?
    Ace, Nov 23, 2010
  5. Danny Colyer

    bod43 Guest

    Or a Heisenberg-Aristotle reflective which is only reflective
    when it is not thinking.
    bod43, Nov 23, 2010
  6. Danny Colyer

    Peter Fox Guest

    Or a Heisenberg-Aristotle reflective which is only reflective
    A self-evident contradiction there.
    Reflection _is_ thinking.

    OTOH do you mean a female reflective: Only reflects when it thinks it will
    and someone is there to say "ooh how pretty"?
    Peter Fox, Nov 23, 2010
  7. In
    Or a Schrödinger reflective, whose state of reflectiveness is indeterminate
    until someone shines a light at it. At which point it's either reflective
    or it isn't.
    Dave Larrington, Nov 23, 2010
  8. Danny Colyer

    Paul - xxx Guest

    Wrong way round, it only thinks when it reflects, and will say "ooh how
    pretty" only when someone's there to hear it ...
    Paul - xxx, Nov 23, 2010
  9. Danny Colyer

    Nigel Cliffe Guest

    I think that's just a variant of the Never Ready cycle lamp.
    Its a potential lamp until someone throws the switch when its either a lamp
    or a brick.

    - Nigel
    Nigel Cliffe, Nov 23, 2010
  10. How about a Cartesian reflective, which only exists when it is

    Matthew Vernon, Nov 23, 2010
  11. Danny Colyer

    bugbear Guest

    OT, reminds me of an encounter my SO had in a supermarket
    during the BSE thingy.

    Customer: I want meat that isn't on the bone
    (Shop-person indicates various packs of boneless meat).
    Customer: No. All of that *HAS BEEN* on the bone.

    bugbear, Nov 23, 2010
  12. Danny Colyer

    Simon Mason Guest

    I had the obverse of this when arriving at work in a dark cycling jacket
    festooned with reflective bits.

    "Don't you wear a yellow hi-vis jacket at night?"

    SM: "Well, colours don't really work in the dark."
    Simon Mason, Nov 23, 2010
  13. Danny Colyer

    nmm1 Guest

    Or possibly that only its converse exists whenever it is observed?

    Nick Maclaren.
    nmm1, Nov 23, 2010
  14. Danny Colyer

    Tim Hall Guest

    Nah, you shine a light on it and wake up a very grumpy cat.
    Tim Hall, Nov 23, 2010
  15. Danny Colyer

    Adam Funk Guest

    Optics was one of my favourite parts of physics classes. I don't
    remember a lot of it, but ISTR that yellow object (for example) only
    reflect a part of the visible spectrum.
    Adam Funk, Nov 23, 2010
  16. Danny Colyer

    Adam Funk Guest

    Shark (but I'm under the impression very little of it, if any, is
    Adam Funk, Nov 23, 2010
  17. Alan Braggins, Nov 24, 2010
  18. Danny Colyer

    Mike Causer Guest

    Also Rock Salmon (a species of shark), shellfish, snails, crustacea, sea
    cucumber, beetles, grubs, termites, etc. All of which are eaten in
    some places, including the fastidious UK in many cases.

    My favourite "lack of wit" in food came at a company Christmas dinner,
    where a serious vegan was sitting nearby. She stated that "nothing
    that has a sex life" could pass her lips. Which broke me up because
    she was eating deep-fried mushrooms at the time.

    The body of the fungus is underground, the mushroom is simply its
    reproductive organ.

    Mike Causer, Nov 24, 2010
  19. they mean fluorescent I would guess. I have very little reflective and
    no fluorescent stuff going for the low flying airplane look, ie lots of
    lights and number of which have some serious punch.

    Roger Merriman, Nov 24, 2010
  20. Danny Colyer

    Adam Funk Guest

    Is that a mushroom in your pocket or --- never mind.
    Adam Funk, Nov 24, 2010
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