A fact from Minna Lammert appeared on Wikipedia's Main Page in the Did you know column on 25 July 2018 (check views). The text of the entry was as follows:
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It's explained in detail in the article Rhinemaidens#On stage, pictured: a complicated machinery or "apparatus" (in the historic source) to make them appear swimming. I thought it was too much detail for her article, but feel free to take over from there what you think is needed. --Gerda Arendt (talk) 08:18, 24 July 2018 (UTC)[reply]