Previously, I introduced the patch, the 4-patch block, and the repeated block pattern.

I showed patterns of the shapes inside the pattern.

Today, I’ll begin combining shapes.

Shape AB:

Shape A and Shape B have nothing in common other than existing on the same plane. They can be the same color, or they can be different colors as long as both colors are different from the background color.

Shape AC:

Shape AD:

Shape A touches Shape D in three locations as shown in red.

I’m only concerned with the upper two locations because of the shared lines between the two shapes.

This pattern requires two 4-patch blocks as shown, alternated like a checkerboard.

There is a second set of Shape AD(1) here, but you have to add a third color to see it.

This pattern requires two 4-patch blocks as shown, alternated like a checkerboard.

There is a second set of Shape AD(2) here, but you have to add a third color to see it.

Shape BC:

Shape BD:

This pattern requires two 4-patch blocks as shown, alternated like a checkerboard.

There is a second set of Shape BD here, but you have to add a third color to see it.

Shape CD:

Shape C touches Shape D in three locations as shown in red.

This pattern requires three 4-patch blocks as shown.

There is a second set of Shape CD(1) here, but you have to add additional colors to see it.

This pattern requires three 4-patch blocks as shown.

This pattern requires three 4-patch blocks as shown.

There is a second set of Shape CD(2) here, but you have to add additional colors to see it.

This pattern requires three 4-patch blocks as shown.

Next time, I’ll combine three shapes . . .