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thanks for guessing
!ENGAGE10

Great guess @kellyane and it definitely explains the mysterious "keyhole" at the top of the object in the shadow as shown in the image posted by @nineclaws!

It does explain that keyhole at the top well.


@numa26 entered with a very solid guess as well Did you see the anchor? @nineclaws⚓👥

I just looked now and it's a really good guess!