Image Transcription: Meme

[Four images of toilet roll holders, each with text above them.

The first shows a toilet roll holder holding a partially-used roll of toilet paper. Its text reads, "Non-zero value".

The second shows a holder holding a completely used roll of toilet paper, leaving just the cardboard tube. Its text reads, "0".

The third shows a holder with no toilet roll or cardboard tube on it at all. Its text reads, "null".

The fourth shows no holder; simply plain wall. Its text reads, "undefined".]

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