E started playing with this box when my mom and I were sewing before Christmas. It's open at both ends, but she was determined to put Kapla blocks in it. I heard her whining and fussing to herself as she put each block in and it went out the other side. (I was glad the camera was nearby!) She brought the box and blocks to me, and she looked shocked when I couldn't get the blocks to stay in the box either. Then she stood the box on one end on the floor, and she was finally successful! She was briefly satisfied before the box fell over. Poor baby.