One idea could be to get him a set of high-quality watercolor paints and brushes. This allows him to create even more detailed and vibrant paintings. You could even consider getting him watercolor paper or a watercolor instructional book to help him improve his skills. Alternatively, you could schedule a private watercolor painting class for the two of you as a fun and memorable experience. Another option could be to commission a local artist to paint a custom watercolor portrait of the two of you or a picture of a special place the both of you have visited together.
Or you can get him a star map with the date when 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.