If you’ve ever taken a bus or a train, you started looking for a seat and found row after row of horrible colors, patterns, and squiggly blobs. All this time you thought seat designers had bad taste, but might they be hiding something instead?

Turns out, these seats aren’t just covered in unsold fabric store rejects, they’re covered in scientifically designed patterns that are designed to trick your eyes into skipping over however much dirt and grossness has settled on them. When you glance at them, all you can see are bowling alley carpets, but that’s just so you won’t see how much ass dust is resting on them.

Don’t believe me? See for yourself: