What is the thing behind the question mark doing?
1 Answer
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It is
(ahem) LAYING
because the other pictures are
Max Roach DRUMMING
Sidney Bechet PIPING
Jonathon Edwards LEAPING
The Nicholas Brothers DANCING
Vermeer's milkmaid MILKING
Michael Phelps SWIMMING
Ergo the next picture will be
something LAYING per the Twelve Days of Christmas