Oh right, to signify that those tiles will crumble when you walk over them. Sorry, it's been a long work day and my brain is not exactly processing things efficiently anymore.
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"With the first link, the chain is forged. The first speech censored, the first thought forbidden, the first freedom denied, chains us all irrevocably." [...] The first time any man's freedom is trodden on, we're all damaged. - Captain Jean-Luc Picard
B*tch, meet reality. Reality, meet b*tch. - Me