If your best friend is interested in the brain, there are many gift options available. Here are some ideas from various sources:

1. A homunculus model
2. Brain lamp
3. Brain model
4. Neuron model/painting/jewelry
5. Brain paperweight
6. Galton Board, Galton Box, Bean machine
7. Psychology-themed cups and teeshirts
8. A metronome
9. A set of optical illusions
10. Speed cubes
11. Euler’s disc
12. Chaos pendulum (double rod pendulum or swinging sticks)
13. Tall informational poster
14. Canva or Grammarly membership
15. Emotion octopus: Can be an excellent, fun therapy tool

Other gift ideas for best friends that are not specific to the brain but may still be appreciated include:

1. Customized book filled with your favorite memories
2. Fitbit Charge 5 for the fit friend
3. Youll Always Be My Best-Tea Mug
4. Box of messages with a dozen meaningful, heart-shaped reasons for your friendship
5. GLDN Handwriting Bar Bracelet

Ultimately, the best gift for your best friend will depend on their individual interests and preferences.