# Abstract

We introduce a technique to visualize the gradual evolutionary
change of the shapes of living things as a morph between known
three-dimensional shapes. Given geometric computer models of
anatomical shapes for some collection of specimens - here the
skulls of the some of the extant members of a family of monkeys
- an evolutionary tree for the group implies a hypothesis about the
way in which the shape changed through time. We use a statistical
model which expresses the value of some continuous variable at
an internal point in the tree as a weighted average of the values at
the leaves. The framework of geometric morphometrics can then be
used to define a shape-space, based on the correspondences of landmark
points on the surfaces, within which these weighted averages
can be realized as actual surfaces.

# Awards and publications

- David F. Wiley, Nina Amenta, Dan A. Alcantara, Deboshmita Ghosh, Yong J Kil,
Eric Delson, Will Harcourt-Smith, F. James Rohlf, Katherine St. John, and Bernd Hamann,
**"Evolutionary Morphing"**,
*Proceedings of IEEE Visualization, 2005*
- We received an honorable mention in Science Magazine's 2005 Science and Engineering
Visualization Challenge.
The slide show showing our video and other winners can be found at
Science Magazine's web site.