Greetings, witches and warlocks!<br/><br/>Today's metaphysical topic is colour, or more specifically: a colour.<br/><br/>Yes, I am fully aware that I have already touched upon the subject (https://elliquiy.com/forums/index.php?topic=290221.msg14491467;topicseen#msg14491467), but there was one magical colour that I neglected to mention.<br/><br/>No my friends, it is not octarine -- I would never presume to trespass on the late Sir Terry Pratchett's turf so blatantly -- but rather a hue so elusive, that it raises the phylosophical question of whether it is a colour or a lack of one.<br/><br/>I am talking about "transparent".<br/><div class="floatright"><div align="center"><span class="bbc_size" style="font-size: 60pt;"><strong>Soylent Green<br/>is people!!!</strong></span><div align="center"></div></div></div><br/>But what use is a colour that cannot be seen?<br/>What can you do with it?<br/><br/>It turns out that there are some interesting uses...<br/><br/>You can use it as an "inline spoiler" that appears blank until you select it.<br/><br/>For example:<br/><br/>Q. What is the ultimate answer to life, the universe, and everything?<br/>A. [42]<br/><br/>Go ahead, select that empty space between the brackets...<br/><br/>This is how it's done:<br/><br/><div class="codeheader">Code: <a class="codeoperation" href="javascript:void(0);" onclick="return smfSelectText(this);">[Select]</a></div><pre style="margin: 0; padding: 0;"><code class="bbc_code">Q. What is the ultimate answer to life, the universe, and everything?<br/>A. [[color=transparent]42[/color]]</code></pre><br/>Moreover, it can be used to embed secret messages in your posts, concealing them from the prying eyes of the FBI, CIA, NSA, and<abbr title="Steffy's Magic Shop">SMS</abbr>.<br/>In fact, this very post contains such a message.  Can you find it?<br/><br/>Take care,<br/>-- Al<br/>