title: Multicol and a floating box at the top of page, with text wrapping around it
body: <p>I'm writing an article for a magazine. I'm trying to insert a (floating) 2-column box at the upper right corner of a 3-column document, with the text wrapping around it nicely andn the columns being aligned. I'm making the box using the tikz package so I can have a box with rounded edges and a background color.
  I was trying to do the wrapping using wrapfig (and I've tried some minipage stuff as well), but I can't get it to work.</p>
  
  <p>This is some code that explains what I'm trying to do, and how I've been trying to do it:</p>
  
  <pre><code>\documentclass{article}
  \usepackage{wrapfig}
  \usepackage{tikz}
  \usepackage{multicol}
  
  \definecolor{col}{rgb}{0.6,0.6,0.9}
  \setlength{\columnsep}{0.5cm}
  \newcommand{\floatingBox}[3]
  {
   \noindent
   \begin{wrapfigure}{#1}{#2}
   \begin{tikzpicture}
   \node[rounded corners=5pt, fill=col, text width=\linewidth]{#3};
   \end{tikzpicture}
   \end{wrapfigure}
  }
  
  \begin{document}
  \begin{multicols}{3}
  \large
  Some random rambling to fill a page.
  
  Aardvark AB aback abacus abaft abalone abandon abandoned abandonment abase
  abasement abash abashed abate abatement abattoir abbess abbey abbot 
  abbreviate abbreviation ABC abdicate abdication abdomen abdominal abduct 
  abduction abeam abed aberrant aberration abet abeyance abhor abhorrence 
  abhorrent abide abiding ability abject abjure ablaze able able-bodied ABM 
  abnegation abnormal abnormality aboard abode abolish abolition abolitionist 
  A-bomb abominable abominate abomination aboriginal aborigine abort abortion 
  abortionist abortive abound about about-face above aboveboard abracadabra 
  abrade Abraham abrasion abrasive abreast abridge abridgment abroad abrogate 
  abrogation abrupt abscess abscond absence absent absentee absenteeism 
  absent-minded absinthe absolute absolute zero absolution absolutism absolve 
  absorb absorbency absorbent absorbing absorption abstain abstemious 
  abstention abstinence abstinent abstract abstracted abstraction abstruse 
  absurd absurdity abundance abundant abuse abusive abut abutment abysmal 
  abyss AC acacia academia academic academician academy a cappella accede 
  accelerate acceleration accelerator accent accentuate accentuation accept 
  acceptability acceptable acceptance access accessibility accessible 
  accession.
  
  
  \floatingBox{tr}{2\columnwidth + 1\columnsep}{
  \begin{multicols}{2}
  A box that spans 2 columns and should be floating on top of the page with 
  the text wrapping around it.  It's aligned to the right, so it would be 
  exactly above 2 entire columns, with one column to its left.
  \end{multicols}
  }
  
  
  Accessory accident accidental accident-prone acclaim acclamation acclimate 
  acclimation acclimatization acclimatize accolade accommodate accommodating 
  accommodation accompaniment accompanist accompany accomplice accomplish 
  accomplished accomplishment accord accordance accordingly according to 
  accordion accost account accountability accountable accountant accounting 
  accouterments accredit accreditation accrue accumulate accumulation 
  accumulative accuracy accurate accursed accusation accusative accusatory 
  accuse accused accusingly accustom accustomed ace acerbic acerbity 
  acetaminophen acetate acetic acid acetone acetylene ache achievable achieve 
  achievement.
  
  \end{multicols}
  \end{document}
  </code></pre>