When a beam of light passes through the colloid, a bright "pathway" appearing in the colloid can be observed from the vertical direction of incident light. The emergence of the Tyndall effect also means that light can be seen. His appearance brought a light path to her world, not the only one, but the first choice...
[Not updated before July 13th, irregularly]
Purpose: In this era where everything is online and text messages are used instead of letters, I hope that everyone can meet the person worth protecting for life.