I attended a funeral ceremony.

Last Monday, I attended a funeral for a my graduate school teacher's father. Though I have not met my teacher's father, I am under obligation to my teacher. So I decided to attend the funeral ceremony.
I had a medical check-up at my office that day. After finishing the medical check-up, I left my office. I stopped by home and changed into a black suit.
When I arrived at ceremony hole, ceremony has started and attendants were making an offering of incense. I offerred incense at the altar, and made a bow to my graduate school teacher's and his family.
The thing impressed me was that some family members were wearing a white triangular cut of cloth on their head.