Thanks to JMS for sending in this link.
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"Unfortunately, visiting the toilet at home is seldom much better, requiring a degree in problem solving. But first we must investigate the real issue, the inspection shelf. The odd shape of the toilet incorporates a shelf that rests above the waterline and acts as an examination table, as it would appear the Dutch pay more attention to their meals after they eat them than when making them.

"The shelf involves you in two things that you’d probably rather not bother with. The first would be indulging in the aroma that lingers for hours after your visit. The second is cleaning the shelf with the provided brush and disinfectant liquid. If you’re a guest in someone’s home you are expected to do your duty and leave the bowl even cleaner than when you arrived."