The sort of alternation between hard and soft that occurs across the front of these pieces is built into them at the start. (artforum.com)
Depending on the issue of what wave is actually expanding, times for consolidation are different and they are actually expected for the two waves that are corrective and the principle of alternation in that case will provide us with the tools and opportunity to trade binary options in the right direction and with the best possible striking price. (7binaryoptions.com)
Or better yet, imagining a balloon that changes color with alternation of breath? (ericspiegelphd.com)