It may be
• A point of departure.
• Used as a base.
• One throws forward.
• Towards a goal.
And according to history, the word and concept were first used by an architect Filippo Brunelleschi in the fifteenth century, who also had a great work in the field of architectures and made two innovations in the architectural field during the practice of his time:
• In the early fourteenth century, work that was related to Florence Cathedral had been disturbed by some challenges and Brunelleschi was again given a task of completing it by adding a dome in it. Before