基于刘慈欣《三体》系列小说设计的书签。
同时也是一个地球日历,每一个书签代表一个标志性事件,或者一个关键时期。
The bookmark design, based on Liu Cixin's triad of novels The Three-body Problem.
It is also an Earth calendar, with each bookmark representing an iconic event, or a key period in the novel.
No use is allowed without explicit permission from owner