#depression.concave_shape__impression__imprint  a concavity in a surface produced by pressing; "he left the impression of his fingers in the soft mud"
  supertype:  concave_shape__concaveshape__concavity  a shape that curves inward
  subtype:  dimple  a small natural hollow in the cheek or chin; "His dimple appeared whenever he smiled"
  subtype:  groove__channel  a long narrow furrow cut either by a natural process (such as erosion) or by a tool (as e.g. a groove in a phonograph record)
     subtype:  dado  a rectangular groove cut into a board so that another piece can fit into it
     subtype:  flute  a groove or furrow in cloth etc especially the shallow concave groove on the shaft of a column
     subtype:  quirk  a narrow groove beside a beading
     subtype:  rabbet__rebate  a rectangular groove made to hold two pieces together
     subtype:  track.groove  a groove on a phonograph recording
     subtype:  rut  a groove or furrow (especially one in soft earth caused by wheels)
     subtype:  stria__striation  any of a number of tiny parallel grooves such as: the scratches left by a glacier on rocks or the streaks or ridges in muscle tissue
  subtype:  dimple.depression  any slight depression in a surface; "there are approximately 336 dimples on a golf ball"
  subtype:  dip.depression  a depression in an otherwise level surface; "there was a dip in the road"
  subtype:  incision__scratch__slit__dent  a depression scratched or carved into a surface
     subtype:  scotch__score  a slight surface cut (especially a notch that is made to keep a tally)
  subtype:  sag__droop  a shape that sags; "there was a sag in the chair seat"
  subtype:  wrinkle__furrow__crease__crinkle__seam__line  a slight depression in the smoothness of a surface; "his face has many lines"; "ironing gets rid of most wrinkles"
     subtype:  crow's_foot__crow's_feet__laugh_line__laughline  a wrinkle at the outer corner of your eyes
     subtype:  dermatoglyphic  the lines that form patterns on the skin (especially on the fingertips and the palms of the hands and the soles of the feet)
     subtype:  line_of_life__life_line__lifeline  a crease on the palm; its length is said by palmists to indicate how long you will live
     subtype:  line_of_heart__heart_line__heartline__love_line__mensal_line  a crease on the palm; palmists say it indicates your emotional nature
     subtype:  line_of_fate__line_of_destiny__line_of_Saturn  a crease on the palm; palmists say it indicates how successful you will be
  subtype:  crevice__cranny__crack__fissure__chap  a long narrow depression in a surface

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