In a blinding flash of inspiration I have the following suggestion...
Give every visitor a page of "like' Stickers. (easy peel vinyl or similar)
On every exhibit have an area where they can stick them.
At the end of a day/week count the like stickers and reset(clean) the area.
If you're brave, give them some 'don't like' stickers too.
Why invent, when you can steal?
:o)
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