What is this graffiti on the walls in Portal 1?

What is this graffiti on the walls in Portal 1? - Blue and White Boat on Water

I just started playing Portal, and found these scrawls on the wall (somewhat hidden). The first two images were in the first level with turrets, and the second was a couple levels after.

image 1, chamber 1

image 2, chamber 1

image 3, chamber 2

It appears represent the companion cube as a friend (symbolized by hearts around the pictures), and the cake.

What does this graffiti mean (if anything), and who wrote it?

portal




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PORTAL - 08 - Over Here



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Images: Wender Junior Souza Vieira, Karolína Balogová, Piotr Arnoldes, Giovanni Garnica

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