The discussion thread at the WeirdToilets subreddit includes extensive discussion as to whether a "stool inspection shelf" is a common feature of toilets in various European and worldwide locations.
Additional discussion at this archived article and in the "washout toilet" section of the Wikipedia page on flush toilets.
"Washout, or Flachspüler ("shallow flush"), toilets have a flat platform with a shallow pool of water. They are flushed by a jet of water from the back that drives waste into the trap below. From there, the water flow removes it into the sewage system. An advantage of the design is that users will not get splashed from below. Taking of stool samples is also simplified. Washout toilets have a shallow pool of water into which waste is deposited, with a trapped drain just behind this pool... Washout pans were among the first types of ceramic toilets invented and since the early 1970s are now only found in a decreasing number of localities in Europe.[citation needed] A washout toilet is a kind of flush toilet which was once predominantly used in Germany, Austria and France. It was patented in Britain by George Jennings in 1852 and remained the standard toilet type in Britain throughout the 19th century..."
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