A familiar or striking attribute is not automatically a technical property. The key question is whether it is peculiar to the species or shared by others.
“Human is a body” covers many different kinds of things and does not identify the species.
“Human is something that walks” describes several animal species and fails to distinguish humans.
“Human is capable of laughter,” in the traditional logical scheme, uses a distinctive property.
This is why rasm employs a property rather than an indiscriminately shared accident.