I have written widely on this subject, my two principal books being "Culture Shock Laos" and "The Lao, Laos, and you". The visitor will meet as many or more cultural differences in Laos as in other countries, but perhaps the thing that sets Laos apart is the marked tolerance of things different. Thus the foreigner will never feel prejudice directed at him or her and rarely feel uncomfortable. Partly this may be explained by the religion: Buddhism is the stated religion of the majority but a good third say they have 'no' religion or play the spirit world. Formal religions like Islam and Christianity make up only about 2% of the population, and are extremely well tolerated (and the Constitution guarantees their rights). The foreigner can therefore interact to the level s/he chooses. If only more countries were as easy going as Laos...