If you do not know how to tune in on and interpret this flow of information it is very much like being deaf and dumb. Meanings will be read into even the slightest gestures. Consequently, avoid displaying unusual facial expressions and motioning in ways that are remotely dramatic or expansive. Instead of pointing, which is considered rude, wave your hand with the palm facing up. Bows are used for expressing appreciation, making apologies and requests, as well as for greetings and farewells.
Bows convey both respect and humility.
Business associates frequently bow to each other. The depth of the bow depends on the recipient' s rank, status. To indicate a negative response, move the open hand, with the palm facing left, in a fanning motion. It's perfectly acceptable here to spit, snort, and sniff in public. Blowing one's nose in public is unacceptable.