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Tom > Tom--Have you considered a laser pointer? Light weight, useable in full sun, and it makes a great cat exercise device. EJB Dear EJB, I have experimented with laser pointers... while they may be useful for overcoming a freeze they are not very effective for gait hesitation i.e. maintaining gait while "on the fly". This is because they don't generate the apparent motion that a stationery object does as one steps over it i.e. it moves with the subject. The other problems are that this is not a hands-free device and is socially conspicuous. Tom