garden putting device

Come on fellas Diabloman asked a perfectly simple question.
Just dig a hole and..........hang on we've been there already.
My solution is, as in nuclear physics and the uncertainty principle,to dig a VIRTUAL HOLE. Every putt will therefore go in ( I think )

In which dimension would this virtual hole exist?

be careful in your choice. pick the wrong one and you'll have virtual student rioting!
 
Thanks Science Boy. Tried a winter putting cup in the ground but soil kept falling in due to hole being rough cut with a trowel!!!
 
Muller rice cup is probably right size but looking for more permanent device - Heard there is one available in Australia that fits into the ground but cant see anything on the net! :D
 
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