The function seems to assign a value between 0 and 1 to words based on their association with a particular concept. A higher value closer to 1 indicates a stronger association with the concept.

Observations from the experiments:
- The word "tennis ball" has a relatively low value of 0.2043, suggesting that it has a weaker association with the concept.
- The word "seconds" has a high value of 0.6859, indicating a strong association with the concept.
- The word "webs" also has a high value of 0.5583, suggesting that it is associated with the concept as well.
- Other words such as "Atlantic Ocean", "style", "melody", "humidity", "championships", "taste", and "geometry" have lower values ranging from 0.0716 to 0.0233, indicating a weaker association with the concept.

Based on these observations, it is difficult to determine the specific concept that the function is selective for. However, we can conclude that the function assigns higher values to words that have a stronger association with the concept, while assigning lower values to words with a weaker association.

Please let me know if you would like me to conduct any additional tests or if you have any further questions.