Leonardo da Vinci’s sketch of a tree illustrates the principle that combined thickness is preserved at different stages of ramification.

The "Tree of Life" is a massive draw in Washington's Olympic National ... and make for quite an awe-inspiring visual attraction. The 40-foot tall tree us seriously spectacular.

STEP 1 Draw a tall triangle in the middle of the page ... Draw a curve joining the top of the tree to the end of the line just beneath it. Repeat this below by drawing a similar curve from ...