I recently came across a very useful and fun set of experiments created by a guy named Doug Harding that have value towards gaining further insight.
As with all successful insight practice, it is important to set aside pre-conceived notions of reality, and actually try the experiments with curiosity, fun, and an investigative spirit.
Here is the original work...
http://www.headless.org/experiments.htmThis particular experiment here, inspired by Harding but created by someone else, triggered some shifts in my understanding.
http://www.spiritualteachers.org/harding_experiment3.htmMore on harding here...
http://www.spiritualteachers.org/douglas_harding.htm----
The way they actually help one attain realization is quite ingenious, in that they use everyday life pointing to challenge underlying mental views of reality.
If you are interested in spiritual enlightenment, I highly reccomend taking a few minutes out of your day to give these are try!