More specifically, the focus/radial lines, which are the ones that grabbed my attention.

So after giving a look at the tags list, I've came up with a quick tag tree:
Tags in parenthesis means I believe they should be aliased to/replaced with the one before them.

• focus_lines ← ( emphasis_lines || zoom_lines )
• radial_speed_lines
• peripheral_speed_lines
• parallel_speed_lines ← ( rising_lines )

1 - In regards to the above, maybe we should create a radial_focus_lines tag as well?
After all, it's possible for these radial lines to have different purposes and effects, like the lines in this comic page:
post #3428673 top left panel: radial_focus_line; bottom left panel: radial_speed_lines

2 - Alias peripheral to radial, or keep them as separate tags, for cases where the lines aren't coming from outside the picture?
I couldn't find an example, but I'm certain there is one.

As for the following, I'm currently too tired to think about the relationship of these.

• motion_lines
• speed_lines ← ( trailing_speed_lines )
• wiggle_lines
• subtle_motion_lines
• direction_lines
• contour_smear_lines
• motion_outline
• directed_motion_outline
• growth_lines
• path_lines
• rotation_lines
• thrust_lines

• impact_lines
• squiggly_lines

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Any thoughts?