Collected half of the family's shoes and went to the park.
As a mathematician this challenge suited me well.
If one can form pairs from a set of object, then the number of objects is even by definition. Like the shoes here. Also 2, 4, 22, 44 are even numbers.
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That is a very nice collection you have there. I think to score higher you needed to take this clever idea and apply it to a different background or scene. The lawn or ground cover competes from my attention.