How about getting him a crossword puzzle book with challenging puzzles that he hasn't completed yet? You can also include a nice pen or pencil set so he can comfortably solve the puzzles. Alternatively, you can try getting him a personalized crossword puzzle with clues that are specific to him and his interests. This will not only keep him entertained but will also add a personal touch to the gift.
Or you can get him a star map with an important date you share.
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.