EUR 3.-Can the sense of Synesthesia be artificially induced?

The sense of synesthesia has always been associated with creativity and intellect. The greatest artists and scientists had synesthesia. A sysnesthetist would say things like "He was painting the fence white, but the paint smelled blue"
Feynman used to see equations in colour. In art and poetry, synesthesia helps in bridging the divide between the senses to achieve remarkable connections between seemingly unrelated objects and ideas. This takes creativity to new levels and uncharted domains. For India's greatest poet, the nobel laureate Rabindranath Tagore, words would always be accompanied by music. When he was composing a song, he did not need to think about the tune separately, it would follow automatically with the lyrics.
The sense of synesthesia is created when people are high on drugs. Hence for many artists, getting high is a pre-requisite before sitting down to work.

http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=11303

My question is: Can synesthesia be induced artificially in a completely safe manner, without the use of drugs?

This question is highly relevant to people who are working on (or interested in) consciousness, cognitive science, neuroscience, psychology etc.

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