pastel playground with various-sized balls floating in a dreamy space

playful pastel spheres whimsical 3d soft colors joyful surreal landscape playground varioussized floating dreamy space gentle hues bouncing serene childlike imagination scene cheerful fantasy balloons art airy light buoyant bubblegum softness levity delicate simplicity minimalist round smooth tranquil colorful abstract festive decoration harmony fun cute artistic design composition smoothness happy ai generated