Chalkboards may be meant for temporary messages, but the illustrations adorning the blackboards at this Oklahoma school haven't been erased in nearly one hundred years.

Construction workers renovating Emerson High School were surprised to find sketches and assignments from 1917 still in tact.

The blackboards had been covered by an earlier renovation, freezing the lessons where they ended for the day.

"I got goosebumps, and then I got tears in my eyes," Principal Sherry Kishore told KOKH News. "And then I sat in here and just stared because it's really like walking into a time capsule."

The school tweeted photos of the discovery:

Counting down until Christmas 1917. Drawings nearly 100 years old found during MAPS construction. pic.twitter.com/2nV7hq8foL

— OKC Public Schools (@OKCPS) June 5, 2015

Counting down until Christmas 1917. Drawings nearly 100 years old found during MAPS construction. pic.twitter.com/2nV7hq8foL

Stuck in time. Drawings from 1917 uncovered during MAPS renovations at #Emerson pic.twitter.com/QDd2IlL3Sx

— OKC Public Schools (@OKCPS) June 5, 2015

Stuck in time. Drawings from 1917 uncovered during MAPS renovations at #Emerson pic.twitter.com/QDd2IlL3Sx

You find a lesson on pilgrims in every classroom. There was #aligned curriculum in #1917. pic.twitter.com/MurjKd8n6i

— OKC Public Schools (@OKCPS) June 5, 2015

You find a lesson on pilgrims in every classroom. There was #aligned curriculum in #1917. pic.twitter.com/MurjKd8n6i

The school district plans to preserve the work that one teacher called "A looking glass into the teachings of 1917."

(WATCH the KOKH-TV video below)  Photo: KOKH video – Story tip from Lynsie Buckmiller

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