By strapping urinals on a bunch of trees, a Dutch designer has solved one of the most serious of men's problems, finding a toilet when you need one.

Sam van Veluw came up with this interesting concept, one night, at a music concertm while he was desperately looking for a public toilet.

As soon as his eyes met a tree, the idea of strapping a waterless urinal onto a tree, simply popped into his head.

Named the P-Tree, this outdoor urinal can be hooked up to a central sewer system, or an onsite infiltration system that would dispose of the fluids and nourish the tree with nitrogen, at the same time.

I'm sure we'll probably never see any P-Tree urinals, at least not in countries with indecent exposure laws, but Sam's idea is definitely refreshing.

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