一応ちゃんと同じ長さになってるはずです
Source: https://twitter.com/Strangestone/status/1642754355253383168

今週のやつはですね、ただ単に谷間の線でこれ（↓）を再現しただけです。妹ちゃんのサイズが姉に追いついたわけではないです。左右両方ともアイちゃんにしとけばわかりやすかったなぁ。学び
https://twitter.com/chairtan/status/1642756838663032834
Source: https://twitter.com/Strangestone/status/1642825839376216064

今週はミュラー・リヤー錯視
Source: https://twitter.com/Strangestone/status/1642768894741057536

In case you're wondering, both lines should be the same length.
Source: https://twitter.com/Strangestone/status/1642754355253383168

This week's post is just using cleavage lines to reproduce this. This doesn't mean that the little sister has caught up in size with her older sister. Maybe it would've been easier to understand if I'd used Ai-chan on both sides. Live and learn.
Source: https://twitter.com/Strangestone/status/1642825839376216064

This week's theme is "The Muller-Lyer Illusion."
Source: https://twitter.com/Strangestone/status/1642768894741057536