Hieroglyphics of Horapollo: Book I: LVIII. How an Impossi...
Hieroglyphics of Horapollo, tr. Alexander Turner Cory, [1840]
To signify an impossibility, they represent A MAN'S FEET WALKING ON THE WATER; or when they would signify the same thing differently, they delineate A HEADLESS MAN WALKING. And since these are both impossibilities, they have with good reason selected them for this purpose.