The contents of the visual and the tactual consciousness have no element in common.
tactual perception, and completed one on visual depth perception.
Touch-sensitive controls should be avoided, to allow tactual exploration.
He maintained that visual consciousness is merely a system of arbitrary signs which symbolize for us certain actual or possible tactual experience - in other words a purely conventional language.
It was evident that a similar analysis might have been applied to tactual consciousness which does not give externality in its deepest significance any more than the visual; but with deliberate purpose Berkeley at first drew out only one side of his argument.