7

Man is built on the number 7.

Color: we perceive light in seven distinct colors: red, orange, yellow, green, blue, indigo, and violet.
Applications
Emotion: emotions are traditionally grouped into seven categories.
Chinese Medicine
Jewish Kaballah
Memory and brain function: the number seven is significant in brain structure; for instance, the human brain can recall up to seven digits in one thought.
Vocal learning and birds
MRI and polygraphing
AI development
Sensation: hearing, imagining?, seeing, SENSING, smelling, tasting, touching.
Sin and virtue: there are seven Cardinal Sins and seven opposing Holy Virtues.
Cardinal Sins
Holy Virtues
Sound: there are seven notes in the diatonic scale.
Time: our understanding of time is based on a seven-day week.