As with many of my other patterns, I needed to experiment. I adjusted both the size of the motif and the purse.
The motif was inspired by one of the geometric patterns on the pre-Columbian building seen below from Mitla, Mexico. Stepped fret motifs work well with tapestry crochet and an almost infinite variety are found around the world.

Mitla wall from (photo from Wiki Commons).
The shape of the Mitla Purse was based on a change purse pattern in my first Tapestry Crochet book. It’s is out of print, but some of the patterns are available online here and here.

Change purses from my 1991 Tapestry Crochet book.
What’s old is new again!