A truncated pyramid is what they call it. A pyramid has a pointed ceiling but for Buddhist temples the ceilings are usually truncated and has very elaborate patterns painted on them. Sometimes these patterns are copied onto scarves. While shopping in Dunhuang last year I saw a lot of these scarves for sale and couldn't figure where they got the pattern. I only found out recently they are copies of the patterns found on the ceilings of temples. What an ingenious idea.