Ungh appreciates stones and is ready to trade for them.

Did you visit the farm house?

Goal has created great art there.

Made out of stone?

STONE-NOT-READY! NEEDS-MORE-TIME-TO-WORK-WITH!

Ungh won't take it as it is not ready.

With time, my friend, with time.

Throw the sculpture into the drill hole in the future zone. You get a nice boulder to give to Ungh.