Combining novelty with routine or ritual is a good way to push the comfort zone without making a child feel threatened. This could be why the use of activity routines appears to be so effective with children who are deafblind. Learning is not taking place in this state. It's just instinct. Slowing the pace a bit and making the environment safer for independent exploration can reduce some of the stress these children may feel.
Feedback is essential in providing an enriched environment.
The most important concept regarding feedback is that it needs to be learner controlled. Often we think feedback should be immediate and verbal, but this does not work for all learners. When you allow choice in how feedback is given, then the feedback is better received and processed. Feedback is at its best when provided by a peer. Providing an environment of relaxed alertness stimulates the connections in the brain.