This is the last part of the 3 part series.
It is the creative process - alternating between inductive and deductive spatial reasoning. It is in rectilinear development, but it will afford students the ability to mentally view in all three dimensions - mentally.
These look difficult...and some are. However, with small amounts of practice, students adapt and excel. These exercises are really handy for high academic students in need of challenging individual projects - and GATE and STEM.
Best to you and your students.