So maybe you should just step around that.
Freelance illustrator James Stowe drew this for a competition in Frost Park, where it was spotted by a Portal-playing Redditor. Awesome work, Stowe!
Step around it? I want to go through and grab a companion cube and/or portal gun.
I want cake, dammit! GLaDOS!!! Where's my ruttin' cake?
I would try to get sucked in, but my writhing around on the pavement covered in chalk might arouse suspicion.