We draw not an equal rhombus, we lower from each party small straight lines of the identical size down, we connect them. It we show basis thickness. Further strictly down we lower straight lines.
We show the volume of legs and a partition between them. Volume is shown drawing two parties of legs, they square, but it is visible to us only these parties.
That's all drawing of a stool is ready.
Watch still drawing lessons:
1. Table
2. Chair
3. Sofa