a playful and heartwarming scene where a toy crane is meticulously building a LEGO heart, piece by piece. The crane's tiny mechanical arm is delicately placing vibrant LEGO bricks to form the heart shape. In the background, a toy bulldozer stands by, its scoop filled with additional LEGO pieces, ready to assist in the construction. The art style should be bright and whimsical, capturing the charm and innocence of childhood play. The focus should be on the detailed actions of the toy crane and the emerging LEGO heart, with warm, inviting lighting enhancing the overall joyful atmosphere. --ar 7:4