How about a book by her/his favorite philosopher? You can also consider a curated book set on philosophy, a subscription to a philosophy magazine, or a philosophy-themed mug, poster or a t-shirt. Another idea could be a philosophical board game or a puzzle that stimulates critical thinking. You could also get her/him tickets to a local philosophy or debate event, or a guided tour to a historic site where a famous philosopher lived or worked.
Or you can get her/him a star map with the date when she/he was born.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.