Penrose3 = html`
<svg height=300 viewBox="0 0 400 400">
<rect height=400 width=400 fill=none stroke="silver"></rect>
<line x1=${points1[0][0]} y1=${points1[0][1]} x2=${points2[1][0]} y2=${points2[1][1]} stroke=black></line>
<line x1=${points1[1][0]} y1=${points1[1][1]} x2=${points2[2][0]} y2=${points2[2][1]} stroke=black></line>
<line x1=${points1[2][0]} y1=${points1[2][1]} x2=${points2[0][0]} y2=${points2[0][1]} stroke=black></line>
</svg>
`