melding of materials

these examples appear cumpoter-designed because of the seamlessness of the seating surfaces on each. from experience i know it is difficult to accuratley convey these sorts of shapes with pen and hand.

but this is not the only element that stands out to me. the fact that there are at least two different materials in each piece leads me to believe these were concieved using CAD.
rendering these would make it much easier to play with materials and see them next to eachother on the piece.

i don't so much like the examples that i have given: they are both rather stretched looking and have unfortunate stances. the consideration put into the planes seems to have eaten into the time put into proportion.