physical interaction to me does not necessarily require touch or the stereotypical definition of physical interaction i would consider it any interactions that take place in the physical word which can include talking and listening which Crawford had metioned as necessary characteristics of interactivity. id say that good physical interactivity would be based on how inclusive it is or how accessible it is to everyone. requiring hands for physical interactivity can exclude people of physical defects just as requiring speech and listening can exclude people who are deaf or mute. it would require a good balance of options and alternatives. i would say that almost all technology is interactive to some extent. that does not mean that they are all good examples of interactivity. i personally feel that Crawford overcomplicates the concept of interactivity and i dont entirely agree on his thoughts about how hard it is to acheive it.