arts and crafts room; drawing and manual arts room
A classroom in a Japanese school where students do drawing, painting, and simple craft projects. 図工 is short for 図画工作.
When I was in elementary school, I made a wooden chair in the arts and crafts room.
Compound of 図工 (ずこう, abbreviation of 図画工作 'drawing and manual arts') and 室 (しつ, 'room').