Lore of Learning/icons

Icons may be used to highlight specific types of content.

Icons should probably be produced as sets using SVG.

Sets may include for example:


 * Pragmatic tip
 * Philosophical note
 * Teaching tip
 * Collaborative learning
 * Contemplative
 * Collaborative learning pattern
 * Anti-pattern
 * Sage on the stage
 * Research question
 * Myth
 * etc.