**Shadows onto walls**

Figure 1 : Shadow of a post *AB* on a wall : Draw lines from *T* through *A*
to create *R*, draw vertical line to *R*, draw line from *S*
through *B* to create *N*: The lines *AR* and *RN* present
the shadow of the post *AB*.

Figure 2 : Shadow of a balcony : Create *W* and draw line to *V*.
Draw a vertical line to *VW* at any point (*Q*) to create *P *as
crossing-point* with VY*,
draw a line from *T* through *Q* to create *R*, draw a vertical
line to *UV* through *R* to create *G *as* *crossing-point
with* a *line through* S *and* P* : The line passing through
*V* and *G* presents the shadow-line of the balcony.

Figure 3 : Shadow of a post onto a beam : Draw line from *T* through *
A* and from *S* through *B* to create *W*. Draw vertical line
through *P* to create *N*, draw line from *N* to *T* to
create *R* : *RN* and *VW* present the shadows of the post *AB*.