Ah, I love this idea! Let me implement physics-based animations where shapes actually behave like real objects - circles fall down, quarter circles rotate into new positions, and each shape type has its own unique behavior.

Perfect! Now I've implemented physics-based animations where each shape behaves uniquely:

🎯 Shape-Specific Behaviors:

Full Circles (●):

• "Fall down" with gravity-like motion
• Slight scale reduction to simulate impact
• Bouncy easing curve for realistic physics

Quarter Circles (◐):

• Rotate exactly 90 degrees clockwise

• Transform into the next logical position:

  • Top-left → Top-right
  • Top-right → Bottom-right
  • Bottom-right → Bottom-left
  • Bottom-left → Top-left
• Smooth rotation with perfect timing

✨ Technical Features:

• Individual Shape Tracking: Each shape has its own animation state
• Physics-Based Easing: Different curves for falling vs rotating
• Position Morphing: Quarter circles actually change their border-radius class
• State Management: Tracks transforms and position changes per shape
• Smooth Resets: Animations smoothly return to original state on mouse leave

🎨 Interaction Details:

• Hover directly on shapes (not just cells) for precise control
• 700ms duration for satisfying, observable motion
• Bouncy easing for falling circles feels natural
• Smooth easing for rotations feels mechanical and precise

Now when you hover on a circle, it literally falls down like gravity is pulling it, and when you hover on quarter circles, they rotate into new positions like mechanical parts! Each shape type has its own personality and behavior.

Ah, I see! You want actual physics where shapes move between cells and permanently change the pattern. Let me implement a system where shapes can fall down through multiple cells, collide with other shapes, and create permanent changes to the grid.

Perfect! Now I've implemented a true physics-based interaction system where:

🎯 Dramatic Shape Physics:

Full Circles (●):

• Click to drop: Circles fall down through multiple cells
• Collision detection: Stop when hitting another full circle
• Permanent replacement: Replace any circles in the landing cell
• Visual trajectory: See the shape actually travel between cells
• Gravity simulation: Falls to the bottom if no obstacles

Quarter Circles (◐):

• Permanent rotation: Click to rotate 90° and stay that way
• Position morphing: Actually changes the border-radius class
• No reversion: Changes persist until clicked again

✨ Advanced Features:

• Cross-cell movement: Shapes can move between any cells in the same column
• Collision system: Falling shapes stop when they hit other full circles
• Permanent state changes: No reverting on mouse leave
• Overlay animations: Falling shapes render above the grid during movement
• Smart landing: Automatically finds the correct landing position

🎨 Visual Excellence:

• 800ms dramatic animations: Long enough to see the full journey
• Scale effects: Falling shapes grow slightly during flight
• Smooth trajectories: Perfect movement from cell to cell
• Hover feedback: Shapes still respond to hover with scale and brightness

Now when you click that blue ball, it will dramatically fall down through the cells, stop when it hits the white ball, and permanently replace it! The entire grid becomes an interactive physics playground where every change is permanent and meaningful.