Keynote transitions query

[AES]

Saw a presentation recently in which a slide started out with 4 similar
and equal sized graphics (4 similar technical plots) arranged in a 2 X 2
array which filled most of the area of the initial slide.

In subsequent slides, each of the individual plots zoomed upward, one at
a time, expanding in size and moving to the center of the screen so as
to cover most of the area of the initial slide, with a frame around the
zoomed plot, and the smaller originals mostly hidden behind it -- and
then, after some discussion of that image, collapsing back down to its
initial position, and the next individual plot zooming up.

Is there a name for this transition? Can the latest version of Keynote
do it? -- or is a special-purpose Keynote plug-in purchasable?