The University of Alaska Fairbanks student spent more than a year and 1,100 bucks on a massive Lego replica of a campus building.
He says it would have gone much quicker, but he had to wait for new Legos to arrive in the mail.
Keltner lost count of just how many of the little plastic blocks went into building his miniature version of the Gruening Building.
The Lego model stands an impressive 2 feet tall and 3 feet wide.
It's now on display at a campus gallery.
Soon, Keltner could have some even bigger projects in mind.
He graduates Saturday with his MBA.