Half a croissant, on a plate, with a sign in front of it saying '50c'
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sand embossing playground roller

 some playgrounds have sand, park personnel could roll a cylindrical impression maker, make full of pictures and math forms on the sand, causing the park sand to be fun, pretty, and educational
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some playgrounds have sand, park personnel could roll a cylindrical impression form over the sand, making pictures and math forms on the sand, causing the park sand to be fun, pretty, and educational for the children
—beanangel, Sep 30 2016

http://ericstaller....%20UFOs/HOLYROLLER/ [xenzag, Oct 01 2016]

Beach Sand Printer https://www.youtube...watch?v=K7Kb4C9054c
I've seen them used to display advertising, too. [Wrongfellow, Oct 06 2016]

Nelson Mandala http://leninja.com....2016/02/mandala.jpg
..but not the one you're thinking of .. [not_morrison_rm, Oct 06 2016]

[link]






       There ya go, beany! [+] I knew there was an area where your knowledge would match your ambitions.
—MaxwellBuchanan, Sep 30 2016
   

       It is a fine idea. I am trying to think of a hybrid pattern roller trash scooper device that would clean trash out of the sane as it printed.
—bungston, Sep 30 2016
   

       //clean trash out of the sane// if only.
—MaxwellBuchanan, Sep 30 2016
   

       Could the children be rolled into the sand ? The educational part would be the lesson "Stay out of the path of very large, heavy metal rollers".   

       This information would be firmly impressed (ha ha) on the survivors (if any).
—8th of 7, Sep 30 2016
   

       [beanangel] What commercial name would you give the roller, to corner the market?   

       Grounds keeper Willie can now make more of an educational impression.
—wjt, Oct 01 2016
   

       Nice idea of using a roller to make images in sand, using embossing process, which is why it already exists - as used here to great effect by the most excellent Eric Staller (see link)
—xenzag, Oct 01 2016
   

       Saw one of them sand mandalas, which was pun-worthy, and predictably it has ended up as a tattoo...linky
—not_morrison_rm, Oct 06 2016
   
      
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