Slide some dirt on your legs so you can feel like you're from a previous time. Everything from the past is in the dirt. Dead people, dinosaur bones, your mom's secrets in a box from her past life. All these things come back to you as you slide the dirt all over your legs.
As you sit there, pretending you're in a previous time you see a centaur (せん)! That's right! Centaurs are from wayyyy in the past.
Currently there are no similar looking kanji which exist in the WaniKani learning system