Two squares of variable size share a vertex. What is the maximal blue fraction?
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Solution
The maximal blue fraction is (√2+1)/4, which is approximately 60,4%.

Poem
The ocean so blue
Is moving half away
And makes a lot of noise
so the little fishes cannot sleep
As the song says today !!
The waves are splashing
They come and go
Just like a storm
They crash back and pulse again
The magnificent ocean view
Keeps treasures in it’s waves so blue
