Grogu nods, taking the ball back. He closed his eyes, holding it between his hands. He projected a few memories to Master Kenobi.

Using the force to unscrew the ball - a knob - from the Razor Crest.
Din taking it from him and scolding him.
Din using the ball to get him to show Ahsoka his ability.

He knew it wasn't right to be attached to an object, but he liked it... And it held a much deeper meaning for him than just a play thing.