Feynman diagram vs Figit

This app introduces the symmetry factors in Feynman diagrams. You can get some intuition for the symmetry factors.

Relax. Focus. Play. Keep your hands busy and your mind engaged with 200+ beautifully crafted interactive fidgets, games, puzzles, and sensory experiences. Whether you're looking to unwind, stay focused, pass the time, or simply enjoy satisfying tactile interactions, Figit is always ready. Every experience is designed with realistic physics and responsive haptic feedback to make your iPhone or iPad feel surprisingly tactile. No account required. Works offline. No Wi-Fi. No audio required. TRY FREE Start with 18 fully playable favorites, including Stretchy Blob, Bubble Wrap, Newton's Cradle, Gearworks, and more. Every interaction responds naturally to taps, drags, flicks, and gestures for a satisfying hands-on experience. UNLOCK THE COMPLETE COLLECTION Upgrade to unlock 180+ total premium interactive experiences, with new content added regularly. Track your usage, your most played fidgets, and even your return on investment. Memory & Creativity • Memory Pack — Mosaic, Carousel, Constellation, Dice, Honey Drip and more using your own photos Drop & Score • Drop Merge — drop balls into the jar, match values to merge them • Stack — tap to lock the platform; overhang gets cut away • Block Blast — drag pieces onto the grid, fill rows and columns to clear them • Bubble Burst — aim your cannon and pop three matching bubbles at once • Tile Merge — swipe to slide and combine tile; reach 2048 • Overflow — tap cells to build chain reactions; bigger cascades score higher Relax & Unwind • Calm & Mindful — calming, meditative experiences • Spectacle & Physics — mesmerizing kinetic toys and satisfying physics simulations • Sensory -- Pin Art, Magnetic Spheres, Aqua Rings, Maze, Kaleidoscope and more Fast-Paced Challenges • Reflexes & Memory • Precision Aim • Split-Second Reactions Music & Rhythm • Drum Kit, rhythm challenges, beat matching, and more Carnival Favorites • Ring Toss, Skee-Ball, Balloon Darts, Knife Block, Fish Bowl, Bottle Shoot, Lucky Ducks, and more Sports Challenges • Pickleball, Curling, Golf Putt, Penalty Kicks, Archery, and more Classic Games • Tabletop Games — Backgammon, Marbles, Jacks, Shut the Box, Nine Men's Morris, and more • Card Games — Solitaire, Blackjack, Cribbage, Gin, Golf Solitaire, and more with no wagering simulation • Strategy Games — Challenge built-in AI in Chess, Checkers, Battleship, Mancala, Gomoku, and more • Puzzle Games — Rubik's Cube, Mastermind, Tower of Hanoi, Nonogram, Hashi, Lights Out, and more Video Game Classics • Fidgets inspired by classic video games — Lane Dash, Sky Lance, Space Raid, Lunar Lander, Pinball, Barrel Run, and MANY more • Fidgets inspired by classic console games — Jungle Run, Bucket Drop, Ricochet, Stinger, Lasso, and Ice Hop • Fidgets inspired by classic handheld games — Football, Baseball, Drag Racing, Hockey, Basketball, and Lane Rush Family & Kids • Shape Drop, Animal Match, Clocks, Pattern Matching, Simple Math, Ordering, Fractions, Color Mix, and more Just for Cats • Laser Pointer, Ants, Yarn, and other interactive toys your cat can enjoy MAKE IT YOURS Create a personalized collection by marking favorites and arranging your home screen exactly the way you want. Quickly search or sort fidgets across the packs. Perfect for: • Relaxing after a long day • Staying focused while working or studying • Keeping restless hands busy • Passing the time while traveling or waiting • Taking quick mental breaks throughout the day Why you'll love Figit: • 200+ interactive experiences • Realistic physics throughout • Rich haptic feedback on every interaction • Works completely offline • No account required • Kid friendly across all fidgets • No sound, so no headphones required • Built for iPhone and iPad • Regular updates with new fidgets and games