Frequent use of metaphors is a key characteristic of the pattern.

Frequent use of metaphors is a key characteristic of the LEARNING PATTERN.

We learn new things be associating them with items that we are familiar with. Thus, the frequent use of metaphors.

Metaphors is a figure of speech that compares one thing to another thing that is completely unrelated with one another.

For example:
Life is a journey.

Life and journey are two things that are unrelated but it is used metaphorically because life can be like a journey because it is process we have to take, Like like journey may seem endless but both have a designated destination. 

One is symmetrical, one is radial.

Collar fitting and sleeve length makes the most sense