Doily has two sets of pyramids (triangles from dc.)
Skill level = Advanced

Pattern 18 on pp 44-45 in Magic Crochet.
Pattern Enigmas de Egipto in Ganchillo Artistico.
Pattern 10, Chinese Puzzle, in Crochet Monthly.

Stitches include chain stitches, single crochet, slip stitches, double triple stitches, 2, 3 and 4 double crochet clusters and picots for a total of 25 rows.