solid, 
graduation 
uniform, layered 
increase layered ,
 combination
horizontal, 
diagonal, 
vertical 
concave 
convex
natural distribution 
perpendicular distribution
 modified distribution / shifted dustribution
directions distribution
points, 
lines,
 angles
Steel blade, 
moving blade 
tension screw 
 ring finger farrell 
thumb Farrell
finger tang
shank
straight and curve
