Ikebana a piece's color combinations, natural shapes, graceful lines, and the implied meaning of the arrangement. Another common but not exclusive aspect present in "ikebana" is its employment of minimalism. Some arrangements may consist of only a minimal number of blooms interspersed among stalks and leaves. The structure of some Japanese flower arrangements is based on a scalene triangle delineated by three main points, usually twigs, considered in some schools to symbolize heaven, human, and earth, or sun, moon, and earth. Use of these terms is limited to certain schools and is not customary in more traditional schools. A notable exception
Learning styles if taught in a method deemed appropriate for the student's learning style. They further show that teachers cannot assess the learning style of their students accurately. There are substantial criticisms of learning-styles approaches from scientists who have reviewed extensive bodies of research. A 2015 peer reviewed article concluded: "Learning styles theories have not panned out, and it is our responsibility to ensure that students know that." There are many different learning styles models; one literature review identified 71 different models. Only a few models are described below. David A. Kolb's model is based on his experiential learning model, as explained