1-For a Penrose triangle, draw a basic triangle with three equal sides. If you have a ruler, use it for each step.
KEY-DETAIL PRACTICE
Using a ruler, first draw a mini Penrose outline to become familiar with the formula
2-From each edge tip, continue the triangle’s lines just a little bit farther, having them all angling in the same direction, for example, to the left.
3-From this extended tip, attach a line parallel to the adjacent side’s line.
4-From that new line, make a small check-mark edge.
5-From that check mark, and again parallel to the side line, make sure the gaps between each triangle are equally spaced around all edges.
6-Connect any open gaps or corners.
7-The inner structure gets the value gradient. You’ll shade from dark to light, and you should have three inner edges. At the top of the inner edge, start with your darkest value and gradually lighten up as you reach halfway down this track.
8-Repeat for the remaining two corners.
Artist Trick
Plan your shading out ahead of time to prevent two mid-tones or two darks from being adjacent to each other.
