Blue-sky and Brain wave

Blue-sky adjective - Without immediate commercial value.

Brain wave and blue-sky are semantically related in creative topic. In some cases you can use "Brain wave" instead an adjective phrase "Blue-sky".

Brain wave noun - (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph.

Blue-sky and brain wave are semantically related in creative topic. Sometimes you can use "Blue-sky" instead an adjective phrase "Brain wave".