"All right, because Spike's been learning this the last couple of years, I'll be having him practice on his current stuff for now." Celestia said when the two kids got into the library. "Twilight, I need to see where you stand so I'll know what start you on." She pointed towards the mess of items on the table. "Levitate as much stuff off that table as you can. Don't worry about weight, just go for quantity."
"O-ok..." Twilight focused her magic on what, to her, seemed to be the highest count of items. A few seconds later, and a can filled with pencils began to float into the air, wrapped up in her aura. One at a time, the pencils floated out. After the fifth, she looked to be concentrating a little harder. A whimper escaped her lips after pencil eleven came out, and she was gritting her teeth by the time the sixteenth one out. Unfortunately, that was she limit, and they fell with a clatter, several falling to the floor while she slumped slightly, catching her breath.
"That was pretty good, Twilight!" Celestia smiled, putting things back in place. "Next time, though, if you feel the strain, it's normally a good idea to stop then so you don't put a strain on your magic or your body"
"Oh, s-sorry, Princess..." She replied, looking down.
"Easy, you're still learning." Celesta set a hand on her shoulder. "Don't worry about trying to do it perfectly on the first go. You've got plenty of time to work on it. I mean, look at Spike."
They both looked over to where Spike was practicing, just in time for him to fire a ball of flickering jade light at a beach ball. In a flash, the ball was now a cabbage the size of a wagon wheel. "Darn it...!" He scowled.
"What's wrong, Spike?" Twilight looked over at the cabbage. "Looks like you did fine to me."
"I was trying to turn it into a bowling ball..." He fired another spell, this time ending up with bouquet of two dozen tulips. "Darn it!"