Weldon Cipher

Decoding this cipher! https://twitter.com/MikePMoffatt/status/443044704746106880

I started by coding each image by a nickname I gave it. If you don't like my nickname, tough (but read on):

threecircle leaf bubble dog apple dotsquare yinyang target square
clover key bird hatch arrow circle dotblob triangle clover threecircle
fire cube bidirection sunfish pacman target three ra flux arrow sun
earth dotblob floyd diamond grass key apple bubble dotcircle ra target
pacman star apple hook yinyang clover triangle bird ra square brush
dotsquare three bigstar bubble waves target ra triangle dotcircle phi
star grass leaf threecircle star diamond threecircle circle desktop
bidirection dotblob tack sun dotcircle threecircle circle ra fire
dotsquare bigstar cube key leaf dotsquare phi bubble splitcircle leaf
feather floyd brush circle triangle star remote pacman remote
dotcircle threecircle gem frame triangle square trefoil puzzlepiece
bird apple arrow yinyang feather dotblob bigstar tack apple star ra
brush square leaf hand threecircle bubble dotcircle phi sun

I loaded this into python and did a couple quick transformations:

---Symbols to unique integer index:---
square: 8
apple: 4
frame: 43
trefoil: 44
dog: 3
hook: 32
diamond: 28
brush: 33
earth: 26
desktop: 37
sunfish: 20
leaf: 1
sun: 25
three: 22
threecircle: 0
ra: 23
hatch: 12
dotsquare: 5
circle: 14
feather: 40
bubble: 2
bird: 11
clover: 9
phi: 36
cube: 18
triangle: 16
splitcircle: 39
fire: 17
dotcircle: 30
hand: 46
floyd: 27
key: 10
waves: 35
bigstar: 34
gem: 42
remote: 41
target: 7
dotblob: 15
pacman: 21
bidirection: 19
flux: 24
tack: 38
arrow: 13
puzzlepiece: 45
yinyang: 6
grass: 29
star: 31

---Cipher by index number---
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 9, 0, 17, 18, 19, 20, 21, 7, 22, 23, 24, 13, 25, 26, 15, 27, 28, 29, 10, 4, 2, 30, 23, 7, 21, 31, 4, 32, 6, 9, 16, 11, 23, 8, 33, 5, 22, 34, 2, 35, 7, 23, 16, 30, 36, 31, 29, 1, 0, 31, 28, 0, 14, 37, 19, 15, 38, 25, 30, 0, 14, 23, 17, 5, 34, 18, 10, 1, 5, 36, 2, 39, 1, 40, 27, 33, 14, 16, 31, 41, 21, 41, 30, 0, 42, 43, 16, 8, 44, 45, 11, 4, 13, 6, 40, 15, 34, 38, 4, 31, 23, 33, 8, 1, 46, 0, 2, 30, 36, 25

---symbols by frequency---
1: ['frame', 'trefoil', 'dog', 'hook', 'earth', 'desktop', 'sunfish', 'hatch', 'splitcircle', 'hand', 'waves', 'gem', 'flux', 'puzzlepiece']
2: ['diamond', 'three', 'feather', 'cube', 'fire', 'floyd', 'remote', 'bidirection', 'tack', 'grass']
3: ['brush', 'sun', 'bird', 'clover', 'phi', 'key', 'bigstar', 'pacman', 'arrow', 'yinyang']
4: ['square', 'dotsquare', 'circle', 'target', 'dotblob']
5: ['apple', 'leaf', 'bubble', 'triangle', 'dotcircle', 'star']
6: ['ra']
7: ['threecircle']