In what year, Filippo Brunelleschi demonstrated the geometrical method of perspective by painting the outlines of various Florentine buildings onto a mirror?

In the year 1425.

Explanation:

Filippo Brunelleschi was a Florentine architect who was considered to be the founder of modern Renaissance architecture. He was also the inspiration that helped many later architects including Michelangelo.

In the year 1425, he decided to paint the outlines of various Florentine buildings onto a mirror. This he did by starting to paint the Florentine Baptistery to be looked through a mirror reflection that is to be viewed from a small hole drilled at the back of the picture and the mirror kept at arm’s length.  

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