asian
black
blackboard
blank
board
chalk
chalkboard
class
classroom
concept
difficult
education
ethnic
hands
holding
idea
learning
male
math
mathmatician
memo
men
multi racial
notebook
notepad
notes
notice board
one person
oriental
pad
paint
pen
problem
pythagoras
pythagorean
representation
school
schooling
scribble
standing
student
taking notes
teacher
texture
theorem
triangle
unrecognisable people
visual
wood
writing
young
young adult