Edgar Dale developed the Cone of Experience theory in 1946 to illustrate how human learning becomes more effective as experiences incorporate more senses and move from abstract to concrete. At the top of the cone is symbolic experience, which involves learning through abstract representations like words. Iconic experience involves learning through visual representations like pictures and occurs below symbolic in the cone. The most concrete and effective form of learning is enactive experience at the bottom of the cone, which involves direct interaction and doing, like learning how to tie a knot by actually tying one. The cone shows that incorporating more senses and concrete experiences results in deeper and more meaningful learning.