From reading the AHS descriptions, Tim Bell's intro would be a sculpted relief form.
From the AHS website:
A Sculpted Form daylily has three-dimensional structural features involving or emanating from the throat, midrib or elsewhere on the petal surface. Sculpted forms belong to one of three different groups: Pleated, Cristated or Relief.
PLEATED:
In the pleated group, petals that have a deep longitudinal crease on each side of the midrib. These creases cause folding of the petal upon itself creating a raised platform extending from the top of the perianth tube and ending between the throat and the petal tip.
CRISTATED:
This category refers to flowers having appendages of extra petal tissue growing from the midrib or elsewhere on the surface of the petals. When the extra tissue grows from the midribs, the form is called "Midrib Cristated". (Other Cristated forms have been referred to as "gothic" in The Daylily Journal.) Such Cristated Forms referred to by many as "Cresting" can occur on single and double daylilies, but by itself, does not make a daylily double.
RELIEF:
Daylilies falling into this category are characterized by vertically raised ridges that extend from the throat and project from the petal surface. The ridges may grow parallel to the veins, or they may radiate outwards from each side of the midrib.
