diff --git a/src/programs/basics/coordinates_index.js b/src/programs/basics/coordinates_index.js
index efa234a..3b40d18 100755
--- a/src/programs/basics/coordinates_index.js
+++ b/src/programs/basics/coordinates_index.js
@@ -6,10 +6,10 @@
 */
 
 // Global variables have scope in the whole module.
-const chars = '▁▂▃▄▅▆▇▆▅▄▃▂▁ '.split('')
+const pattern = '▁▂▃▄▅▆▇▆▅▄▃▂▁ '.split('')
 
 // Resize the browser window to modify the pattern.
 export function main(coord, context, cursor, buffers){
-	const i = coord.index % chars.length
-	return chars[i]
+	const i = coord.index % pattern.length
+	return pattern[i]
 }
diff --git a/src/programs/basics/how_to_draw_a_circle.js b/src/programs/basics/how_to_draw_a_circle.js
index 885ecb5..fc7b461 100755
--- a/src/programs/basics/how_to_draw_a_circle.js
+++ b/src/programs/basics/how_to_draw_a_circle.js
@@ -38,7 +38,7 @@ export function post(context, cursor, buffers){
 	txt += 'to change the aspect ratio:\n'
 	txt += 'aspectRatio = ' + ar + '\n'
 
-	// Box style
+	// Custom box style
 	const style = {
 		x : 3,
 		y : 2,
diff --git a/src/programs/basics/time_milliseconds.js b/src/programs/basics/time_milliseconds.js
index d5b1b68..99544a7 100755
--- a/src/programs/basics/time_milliseconds.js
+++ b/src/programs/basics/time_milliseconds.js
@@ -6,7 +6,7 @@
 */
 
 // Globals have module scope
-const chars = 'ABCxyz01═|+:. '.split('')
+const pattern = 'ABCxyz01═|+:. '.split('')
 
 // This is the main loop.
 // Character coordinates are passed in coord {x, y, index}.
@@ -17,9 +17,9 @@ export function main(coord, context, cursor, buffers){
 	const x = coord.x
 	const y = coord.y
 	const o = Math.sin(y * Math.sin(t) * 0.2 + x * 0.04 + t) * 20
-	const i = Math.round(Math.abs(x + y + o)) % chars.length
+	const i = Math.round(Math.abs(x + y + o)) % pattern.length
 	return {
-		char   : chars[i],
+		char   : pattern[i],
 		weight : '100', // or 'light', 'bold', '400'
 	}
 }
diff --git a/src/programs/camera/camera_gray.js b/src/programs/camera/camera_gray.js
index 072fcef..8311240 100755
--- a/src/programs/camera/camera_gray.js
+++ b/src/programs/camera/camera_gray.js
@@ -12,7 +12,7 @@ const cam = Camera.init()
 // For a debug view uncomment the following line:
 // cam.display(document.body, 10, 10)
 
-const chars = sort(' .x?▂▄▆█'.split(''))
+const density = sort(' .x?▂▄▆█'.split(''))
 
 export function pre(context, cursor, buffers){
 	cam.cover(context).normalize().mirrorX().write(buffers.data)
@@ -21,8 +21,8 @@ export function pre(context, cursor, buffers){
 export function main(coord, context, cursor, buffers){
 	// Coord also contains the index of each cell:
 	const color = buffers.data[coord.index]
-	const index = Math.floor(color.gray / 255.0 * (chars.length-1))
-	return chars[index]
+	const index = Math.floor(color.gray / 255.0 * (density.length-1))
+	return density[index]
 }
 
 import { drawInfo } from '/src/modules/drawbox.js'
diff --git a/src/programs/camera/camera_rgb.js b/src/programs/camera/camera_rgb.js
index 1f121f9..c2cfc59 100755
--- a/src/programs/camera/camera_rgb.js
+++ b/src/programs/camera/camera_rgb.js
@@ -12,7 +12,7 @@ const cam = Camera.init()
 // For a debug view uncomment the following line:
 // cam.display(document.body, 10, 10)
 
-const chars = ' .+=?X#ABC'.split('')
+const density = ' .+=?X#ABC'.split('')
 
 // A custom palette used for color quantization:
 const pal = []
@@ -34,9 +34,9 @@ export function main(coord, context, cursor, buffers){
 	// Coord also contains the index of each cell
 	const color = buffers.data[coord.index]
 	// Add some chars to the output
-	const index = Math.floor(color.gray / 255.0 * (chars.length-1))
+	const index = Math.floor(color.gray / 255.0 * (density.length-1))
 	return {
-		char       : chars[index],
+		char       : density[index],
 		color      : 'white',
 		// convert {r,g,b} obj to a valid CSS hex string
 		background : rgb2hex(color)
diff --git a/src/programs/demos/mod_xor.js b/src/programs/demos/mod_xor.js
index d0fd239..9bb2333 100755
--- a/src/programs/demos/mod_xor.js
+++ b/src/programs/demos/mod_xor.js
@@ -7,7 +7,7 @@ https://twitter.com/ntsutae/status/1292115106763960327
 [header]
 */
 
-const chars = "└┧─┨┕┪┖┫┘┩┙┪━".split('')
+const pattern = "└┧─┨┕┪┖┫┘┩┙┪━".split('')
 
 export function main(coord, context, cursor, buffers){
 	const t1 = Math.floor(context.time * 0.01)
@@ -16,8 +16,8 @@ export function main(coord, context, cursor, buffers){
 	const y = coord.y + t1
 	const m = t2 * 2 % 30 + 31
 	const i = (x + y^x - y) % m & 1
-	const c = (t2 + i) % chars.length
-	return chars[c]
+	const c = (t2 + i) % pattern.length
+	return pattern[c]
 }
 
 import { drawInfo } from "/src/modules/drawbox.js"
diff --git a/src/programs/demos/sinsin_checker.js b/src/programs/demos/sinsin_checker.js
index 9e02927..b7ffd45 100755
--- a/src/programs/demos/sinsin_checker.js
+++ b/src/programs/demos/sinsin_checker.js
@@ -5,7 +5,7 @@
 [header]
 */
 
-const chars = [
+const pattern = [
 	" _000111_ ".split(''),
 	".+abc+.      ".split('')
 ]
@@ -25,7 +25,7 @@ export function main(coord, context, cursor, buffers){
 	const i = f(Math.abs(x + y + o))
 	const c = (f(coord.x * 0.09) + f(coord.y * 0.09)) % 2
 	return {
-		char       : chars[c][i % chars[c].length],
+		char       : pattern[c][i % pattern[c].length],
 		color      : 'black', //col[c],
 		background : 'white', //col[(c+1)%2],
 		weight     : weights[c],
diff --git a/src/programs/demos/sinsin_wave.js b/src/programs/demos/sinsin_wave.js
index 3ba571a..b742fd7 100755
--- a/src/programs/demos/sinsin_wave.js
+++ b/src/programs/demos/sinsin_wave.js
@@ -5,15 +5,15 @@
 [header]
 */
 
-const chars = '┌┘└┐╰╮╭╯'.split('')
+const pattern = '┌┘└┐╰╮╭╯'.split('')
 
 export function main(coord, context, cursor, buffers){
 	const t = context.time * 0.0005
 	const x = coord.x
 	const y = coord.y
 	const o = Math.sin(y * x * Math.sin(t) * 0.003 + y * 0.01 + t) * 20
-	const i = Math.round(Math.abs(x + y + o)) % chars.length
-	return chars[i]
+	const i = Math.round(Math.abs(x + y + o)) % pattern.length
+	return pattern[i]
 }
 
 import { drawInfo } from '/src/modules/drawbox.js'
diff --git a/src/programs/sdf/balls.js b/src/programs/sdf/balls.js
index 990a814..3a52308 100755
--- a/src/programs/sdf/balls.js
+++ b/src/programs/sdf/balls.js
@@ -8,7 +8,7 @@
 import { map } from '/src/modules/num.js'
 import { sdCircle, opSmoothUnion } from '/src/modules/sdf.js'
 
-const chars = '#ABC|/:÷×+-=?*· '.split('')
+const density = '#ABC|/:÷×+-=?*· '.split('')
 
 const { PI, sin, cos, exp, abs } = Math
 
@@ -41,8 +41,8 @@ export function main(coord, context, cursor, buffer){
 	let c = 1.0 - exp(-3 * abs(d));
 	//if (d < 0) c = 0
 
-	const index = Math.floor(c * chars.length)
-	return chars[index]
+	const index = Math.floor(c * density.length)
+	return density[index]
 }
 
 function transform(p, trans, rot){
diff --git a/src/programs/sdf/boxes.js b/src/programs/sdf/boxes.js
index 9cd0d1f..46b3734 100755
--- a/src/programs/sdf/boxes.js
+++ b/src/programs/sdf/boxes.js
@@ -8,7 +8,7 @@
 import { map } from '/src/modules/num.js'
 import { sdBox, opSmoothUnion } from '/src/modules/sdf.js'
 
-let chars = '▚▀abc|/:÷×+-=?*· '.split('')
+let density = '▚▀abc|/:÷×+-=?*· '.split('')
 
 export function main(coord, context, cursor, buffers){
 
@@ -33,8 +33,8 @@ export function main(coord, context, cursor, buffers){
 	}
 
 	let c = 1.0 - Math.exp(-5 * Math.abs(d))
-	const index = Math.floor(c * chars.length)
-	return chars[index]
+	const index = Math.floor(c * density.length)
+	return density[index]
 }
 
 function transform(p, trans, rot){
diff --git a/src/programs/sdf/circle.js b/src/programs/sdf/circle.js
index 74f23b6..308294e 100755
--- a/src/programs/sdf/circle.js
+++ b/src/programs/sdf/circle.js
@@ -8,7 +8,7 @@
 import { sdCircle } from '/src/modules/sdf.js'
 import { sort } from '/src/modules/sort.js'
 
-const chars = sort('/\\MXYZabc!?=-. '.split(''))
+const density = sort('/\\MXYZabc!?=-. '.split(''))
 
 export const settings = { fps : 60 }
 
@@ -24,10 +24,10 @@ export function main(coord, context, cursor, buffer){
 	const radius = (Math.cos(t)) * 0.4 + 0.5
 	const d = sdCircle(st, radius)
 	const c = 1.0 - Math.exp(-5 * Math.abs(d))
-	const index = Math.floor(c * chars.length)
+	const index = Math.floor(c * density.length)
 
 	return {
-		char : coord.x % 2 ? '│' : chars[index],
+		char : coord.x % 2 ? '│' : density[index],
 		background : 'black',
 		color : 'white'
 	}
diff --git a/src/programs/sdf/cube.js b/src/programs/sdf/cube.js
index 0d8874a..f30fdb9 100755
--- a/src/programs/sdf/cube.js
+++ b/src/programs/sdf/cube.js
@@ -12,7 +12,7 @@ import { map } from '/src/modules/num.js'
 
 export const settings = { fps : 60 }
 
-const chars = '  -=+abcdX'.split('')
+const density = '  -=+abcdX'.split('')
 
 // Shorthands
 const { vec3 } = v3
@@ -94,7 +94,7 @@ export function main(coord, context, cursor){
 		d = min(d, sdSegment(st, a, b, thickness))
 	}
 
-	const idx = floor(exp(expMul * abs(d)) * chars.length)
+	const idx = floor(exp(expMul * abs(d)) * density.length)
 
 	if (idx == 0) {
 		const x = coord.x % bgMatrixDim.x
@@ -102,7 +102,7 @@ export function main(coord, context, cursor){
 		return d < 0 ? ' ' : bgMatrix[y][x]
 	} else {
 		return {
-			char  : chars[idx],
+			char  : density[idx],
 			color : 'blue'
 		}
 	}
diff --git a/src/programs/sdf/two_circles.js b/src/programs/sdf/two_circles.js
index 5cb4fd1..1570bba 100755
--- a/src/programs/sdf/two_circles.js
+++ b/src/programs/sdf/two_circles.js
@@ -8,7 +8,7 @@
 import { sdCircle, opSmoothUnion } from '/src/modules/sdf.js'
 import { sub, vec2 } from '/src/modules/vec2.js'
 
-const charMap = '#WX?*:÷×+=-· '.split('')
+const density = '#WX?*:÷×+=-· '.split('')
 
 export function main(coord, context, cursor, buffers){
 	const t = context.time
@@ -35,9 +35,9 @@ export function main(coord, context, cursor, buffers){
 
 	// Calc index of the char map
 	const c = 1.0 - Math.exp(-5 * Math.abs(d))
-	const index = Math.floor(c * charMap.length)
+	const index = Math.floor(c * density.length)
 
-	return charMap[index]
+	return density[index]
 
 }