  Finding features that disentangle the different causes of variation in real
data is a difficult task, that has nonetheless received considerable attention
in static domains like natural images. Interactive environments, in which an
agent can deliberately take actions, offer an opportunity to tackle this task
better, because the agent can experiment with different actions and observe
their effects. We introduce the idea that in interactive environments, latent
factors that control the variation in observed data can be identified by
figuring out what the agent can control. We propose a naive method to find
factors that explain or measure the effect of the actions of a learner, and
test it in illustrative experiments.
