Trees that grow from seeds start out as tiny seedlings, usually growing directly under the parent tree--the tree that dropped its seeds. Often, those seedlings die because they are blocked from receiving sunlight and moisture. However, seedlings raised in nurseries usually do very well, depending on the species of tree.
Italian Renaissance painters and architects including Filippo Brunelleschi, Masaccio, Paolo Uccello, Piero della Francesca and Luca Pacioli studied linear perspective, wrote treatises on it, and incorporated it into their artworks, thus contributing to the mathematics of art.
Linear just means characterized by an emphasis on line.. Linear perspective, therefore, is typically defined as being a means of producing a three-dimensional image onto a two-dimensional surface by the use of lines. (right) Notice that depth is primarily achieved through the use of converging lines which seem to extend out into the distance.