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 perspective is a monocular cue that allows us to perceive the depth and distance of an object. A monocular cue is any depth cue that can be processed by using one eye alone. This is in contrast to binocular cues that require the use of both eyes to perceive distance and depth.