Here are some points to consider:
* The Original Series: Spock does smile in the original series, but it's often subtle and reserved. This fits with his characterization as a logical and emotionless Vulcan. The series focused more on his stoic nature, and smiles were used sparingly for specific moments.
* The Movies: The movies, particularly the reboot series, portray Spock with a wider range of emotions, including more frequent smiling. This may be due to:
* Shifting characterization: The writers and directors of the movies may have chosen to depict Spock as more approachable and relatable by showcasing his emotions more openly.
* Actor's portrayal: Leonard Nimoy, who played Spock in the original series, was known for his subtle expressions. Zachary Quinto, who played him in the reboot, has a more expressive style, contributing to Spock's more frequent smiling.
Ultimately, both interpretations of Spock's demeanor are valid. The original series highlighted his stoicism, while the movies leaned into his more human aspects.