An idea came to my mind. Before we float in a tank and get the full sensory deprivation experience, we could have an experimental session with so called ganzfeld technique. In sensory deprivation, the physical intensity of external stimuli is minimised (ideally eliminated) in most sensory modalities. In the ganzfeld, the idea is to provide homogenous but unstructured stimuli with physical intensity kept at a constant level.

The ganzfeld procedure is probably best known for its uses in parapsychology and psi research, but it can be also used to induce hallucinations, or – to be more precise – pseudohallucinations, considering subjects' awareness of the experimental situation. This state can be achieved with low tech equipment: red light bulb, ping-pong ball, mp3 with white noise, headphones. In practice, we would use red light shining onto halves of ping-pong balls placed over our eyes (so that only diffused light is visible) and listen to white noise through headphones. The spectrum of ganzfeld-induced hallucinations may range from elementary percepts to very vivid dream-like imagery. Some poeople may experience ganzfeld 'blankout', a loss of the sensation of colour and a complete disappearance of the sense of vision for short period of time. Acoustic hallucinations can also occur. It can be exciting to see how our brain reacts in the absence of clearly defined stimuli, attempting to assign meaning even if there is none.