"about math, research papers, science"

"A cupochino in a black cup"

"Ghost cat"

"Dead scary man"

"Sorcerer with a staff of light"

"Mermaid with a treasure map"

"Mermaid with jellyfish"

"Sorceress with a magical mirror"

"Sorceress with a crystal ball"

"Fairy in a dewdrop"

"Viking longship with oars"

"Fairy in a flower garden"

"Steampunk clockwork machine"

"Alien planet with moons"