svg`<svg width="${w}" height="${h}">
<rect width="${w}" height="${h}" fill="none" stroke="blue" />
<g transform="translate(${w/2}, ${h/2})">
${array(h / 2 - 50 | 0).map(i => {
i += 20
return `<path transform="rotate(${random(720)})"
stroke="black"
fill="none"
d="M ${(i + 1) * 2} 0 A ${(i + 1) * 2} ${(i + 1) * 2} 0 0 1 -${(i + 1) * 2} 0"
/>`
}).join('\n')}
</g>
</svg>`