Reminds me of my friend getting stopped in a coffee line over her hand stamped bag. This guy just kept staring at the pattern, asking how she got the lines so straight. She said it was the weirdest but nicest ten minutes of her week, like her hobby was suddenly art. Felt pretty cool to be seen like that.
Did they pull out a notepad and start taking notes? I'm imagining someone just frozen on the sidewalk, totally focused on your stamps like they're trying to crack a secret code.