Curves, squares, arcs, circle, colors, wood, brick, glass, slopes, rectangles, peaks, valleys, flat, vertical.
Garden & Be Well, XO Tara
The next easy design tool? Repetition.
Yes, a good book: Landscape Design: Contrasts & Repetition. (Now, finding time to write it!) Just when you get your contrasts correct it's time to repeat, repeat, repeat......... No worries, it took me a long time to latch on to these tools.