Robert Klemme wrote in post #1101592:
>> and find the workbook from the sheet.
>
> What functionality for?

It's quite useful in case I lose track of the object which is the 
"parent" of the sheet. Consider this example of the current code:

#Shortcut to avoid having to go through the workbook every time
sheet = RubyExcel.new.load data
#But now I want the workbook:
myRubyExcel = sheet.ruby_excel

I wanted something akin to Excel VBA's approach
ActiveSheet.parent
=> workbook

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