Thresholds
Learning about threshold made me to think about the theories like behaviourism whereby a learner is seen and treated as an empty vessel that needs to be filled with information. In that process the learner feel like is in the darkness and is unsure  whether it's going forward or backward because there's too much information that puts a learner in a liminal space. Constructive theory takes the learner out of that darkness through transformation and intergration because you begin to change the way of doing things and you link what you have learned with your past experiences because constructivism is based on buildings from the known to the unknown. Therefore threshold can be defined as enlightenment, a stage where your mind is filled with counterintuitive ideas , then  you move from the darkness to the light as you learn in the process. According to Meyer and Land there's no simple way in learning, because learning  start from easy to difficult mastery of the threshold concept.They argue that threshold concept is a concept that often involves messy journeys of back, forth and across the conceptual terrain. The good thing is that ,as you learn along you transform from the stage of darkness you have a better idea of what you have learned. Once you begin to understand you make connection of the new knowledge with your past experiences, that could be either text to text, world to world connection or life experiences you become well rounded. Once you have mastered that knowledge then it becomes irreversible it's bounded.  This shows that if learning is not understood learners will remain in the darkness and in the liminal space. As a teacher you should strive to bring light to learners by acknowledging they go through different stages of learning and they are individuals with mixed abilities.