Based on the experiments performed on the function f(x) with the given inputs, here is a description of the function:

[DESCRIPTION]: The function f(x) appears to be selective for the concept of famous landmarks. It assigns higher values (closer to 1) to inputs that are associated with well-known landmarks such as "Big Ben" and "Buckingham Palace". The function also assigns relatively high values to inputs related to architectural structures, as seen with the input "arch" receiving a value of 0.2043. However, it assigns lower values to inputs that are not closely associated with famous landmarks or architectural structures, such as "Japanese" and "syntax". Overall, the function seems to be selective for the concept of famous landmarks, with additional sensitivity towards architectural structures.