Explanation
In Indonesia, the feet are considered the lowest and dirtiest part of the body, and showing the soles of your feet to someone is a serious insult, especially in social gatherings. This stems from cultural and religious beliefs (predominantly Islamic) that emphasize respect for others by keeping feet pointed away. Even accidentally pointing your foot toward someone or a sacred object is seen as offensive.
Local Tip
Always sit with your feet flat on the floor or tucked under you, and never point your feet toward another person, especially elders or religious items.
How it compares elsewhere
The feet are considered the lowest body part; pointing the soles at someone or touching them with feet is deeply offensive.
Showing the soles of your feet is a grave insult, as feet are seen as unclean in Arab culture.
While less severe than in Southeast Asia, pointing your feet at someone in a formal setting (e.g., during a bow) is considered disrespectful.