mirror principles

[Tisoro]

Пожалуйста, помогите перевести.

Выражение встречается в следующем контексте:
Unfortunately, this historic painting is lost, but its composition was probably based on a geometric diagram combining mirror principles with certain other traditional measuring techniques employed by land surveyors, and possibly new projection methods inspired by cartography

Заранее спасибо

[cent]

принципы зеркального отражения (ИМХО)