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I've tried looking at the paper from different angles, and nothing is jumping out at me. I'm not sure what to try next. 7*8 grid with partially and completely filled squares.

Thanks!

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    $\begingroup$ Looks identical to this page in Martin Gardner book books.google.ca/… $\endgroup$ – Len Jan 30 '15 at 8:51
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    $\begingroup$ I saw this in one of my 8th grade geometry textbooks a decade or so ago. $\endgroup$ – imallett Jan 30 '15 at 15:26
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The answer is:

HELLO - just compress the vertical dimension like this:
enter image description here

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