A tool with the purpose for better insight of bulls/bears influence.
The center, more bright part are the open-close prices, filled green if bullish, red if bearish.
The transparent red and green part, above and below, are the "wick/shadow" area's.
If for example the bears push the price down, far under the open, but the bulls push it right back, so you'll have a large wick,
this will be visible as a large transparent green area below the brighter open-close center area.
Hope this helps!