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  1. #1
    bigC is offline Member
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    Do acid

    Someone posted in Facebook, a picture of a cat in a staircase, and asked people to judge the cat is going up or down.

    A person wrote a comment “The people makes this up must do acid”.

    What does “do acid” mean?

  2. #2
    andrewg927 is offline Senior Member
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    Re: Do acid

    It's a psychedelic drug that makes you hallucinate.

  3. #3
    GoesStation is offline Moderator
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    Re: Do acid

    It's old slang for taking the hallucinogenic drug, LSD.
    I am not a teacher.

  4. #4
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    Re: Do acid

    By the way, the cat is going down the stairs.
    You can tell this from the overhanging pieces on the steps (called the nosing of the tread, apparently). If he is going up the stairs, then a person walking down would be forever tripping over them.

    http://knowyourmeme.com/photos/946472-cats

  5. #5
    bigC is offline Member
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    Re: Do acid

    It seemed the picture was formed by imposing a cat picture on a staircase picture.

    The annotations in the picture are not clear:

    The upper annotation: "If the cat's left palm is resting on this tread, then its left leg is too short compared with the right leg".

    The lower annotation: "If the cat's left palm is resting on this tread, then we can see its left palm, but we can't".


    Click image for larger version. 

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    Last edited by bigC; 07-Aug-2017 at 09:00. Reason: annotations retyped.

  6. #6
    Rover_KE is offline Moderator
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    Re: Do acid

    Quote Originally Posted by bigC View Post
    Someone posted on Facebook[no comma here] a picture of a cat on a staircase, and asked people to judge whether the cat is going up or down.

    Somebody wrote a comment: “The people who made this up must do acid”.
    `

  7. #7
    Tdol is offline Editor, UsingEnglish.com
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    Re: Do acid

    Quote Originally Posted by Raymott View Post
    By the way, the cat is going down the stairs.
    You can tell this from the overhanging pieces on the steps (called the nosing of the tread, apparently). If he is going up the stairs, then a person walking down would be forever tripping over them.

    http://knowyourmeme.com/photos/946472-cats
    Maybe you should add a little acid to your diet to become less sure.

  8. #8
    Skrej's Avatar
    Skrej is offline Key Member
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    Re: Do acid

    Quote Originally Posted by GoesStation View Post
    It's old slang for taking the hallucinogenic drug, LSD.
    And to further clarify why it's called 'acid', the full name is lysergic acid diethylamide.

    The acronym comes from German name Lyserg säure diäthylamid.

    Here's an interesting video of an artist drawing successive self-portraits under the influence of LSD. One might suspect the Cubists of taking it if that movement didn't predate LSD by 20 some years.....
    Wear short sleeves! Support your right to bare arms!

  9. #9
    Tdol is offline Editor, UsingEnglish.com
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    Re: Do acid

    That is a fascinating video.

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