I've done this in the past to explain why CMYK printing angles the halftone screens to avoid Moire patterns.
The attached is not my image (but I swear back in the Xara Xone Workbook series I did this. I'll have to check.
Ha! Found it. http://www.xaraxone.com/webxealot/workbook35/page_5.htm Someone has ripped me off without attribution.
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