Following Peter Taylor's answer to The smallest crossword

 >   It's not hard to construct a 1x1 crossword:   . . .

A single-cell crossword could be called atomic.

  Surreal:    |10     |     Across          Down           Up          Diagonal
 (no black    |       |    ------------    -----------    --------    --------------
  squares)    |_______|    10. A cross.    10. __-ray.    10. Ten.    10. Two

    Zen:       #######                                     Behind
 (one black    #######     ------------    -----------    --------
   square)     #######                                    ?. _____

  • $\begingroup$ Voting to close as "unclear what you're asking" for the "Zen" crossword. $\endgroup$ – Deusovi Jan 1 '16 at 16:35
  • 2
    $\begingroup$ I don't vote to close, but the question is totally unclear to me. Actually there is no question at all... $\endgroup$ – klm123 Jan 1 '16 at 16:37
  • $\begingroup$ @Deusovi correctly answered the "Surreal" puzzle. Deusovi and kim123 responded appropriately differently to the "Zen" puzzle. Congratulations! $\endgroup$ – humn Jan 1 '16 at 20:03
  • 2
    $\begingroup$ @Deusovi This should be reopened. Black squares on crosswords have no content, so a puzzle with just one square has no content if that square is black. I think that's the allusion to 'zen' and fits the OP's comment above. Also, zen is famous for the 'questionless' question(s). $\endgroup$ – Lawrence Jan 1 '16 at 23:08

The answer to "Surreal" is

X. X is a cross, ten in Roman numerals, and written as two diagonal lines; X-rays are a type of electromagnetic wave.


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