The hazel's unusual branch formations make it a delight to ponder, and was often used for inspiration in art, as well as poetry.

The bards, ovates and druids of the Celtic day would intently observe its crazy curly-Q branches. Doing this would lead them into other worlds of delightful fantasy. Much the same way our modern imaginations can be captured by a good movie, the creative Celts were artistically motivated by the seemingly random and wild contortions of the hazel.

A more commonly known fact is that the hazel is considered a container of ancient knowledge. Ingestion of the hazel nuts is proposed to induce visions, heightened awareness and lead to epiphanies. Indeed, the legend of Fionn Mac Cumhail tells of his gaining the wisdom of the universe by simply coming in contact with the essence of the hazel nut.

from Wikipedia:
More than simply putting flowers in a container, ikebana is a disciplined art form in which nature and humanity are brought together. Contrary to the idea of a particolored or multicolored arrangement of blossoms, ikebana often emphasizes other areas of the plant, such as its stems and leaves, and puts emphasis on shape, line, and form. Though ikebana is an expression of creativity, certain rules govern its form.