SpicyNodes was a system for displaying hierarchical data, in which a focus node displays detailed information, and the surrounding nodes represent related information, with a layout based on radial maps. It has web and mobile implementations.
Overview
SpicyNodes displays a central node, orbited by related nodes. Each child node can be linked to other child nodes. As the user navigates from node to node, a root path traces the path back to the home node. In a typical implementation, only child and ancestor nodes are displayed. When the user browses, nodes appear and disappear, and the layout rearranges to fit. It is a generic method, with uses ranging from dynamic poetry, to mind mapping and concept mapping.
Advantages
Visual browsing – Similar to other concept mapping tools, SpicyNodes allows authors to display visual thoughts and links between information, and publish an information map for users to browse.
Non-linear – Users can jump from node to node, or descend into a tree to find specific information. Since the number of nodes increases exponentially with the number of orbits, a user can find a piece of information in only N clicks/taps, while navigating a space of XN nodes, where X=average nodes per orbit. Conversely, node layouts are inefficient for reading contiguous pieces of content in a linear manner.
Disadvantages
Displays a subset – Only a limited number of nodes can fit on a typical screen at once, which requires a large enough screen to fit the nodes, and means it is usually not possible to display all the nodes simultaneously.
Balanced branches – Layouts only make sense if there are balanced branches with fewer than two dozen child nodes. A typical implementation requires an average of 2-10 linked/child nodes per node. Too few, and the layout becomes a string of pearls. Too many, and the nodes do not fit.
Background
SpicyNodes is a radial treelayout engine, modified using force-based algorithms, bias controls, and variable pivot point. It also uses an approach similar to hyperbolic trees to reduce sizes far from the focus node. Key aspects of the method are publicly described. The layout is adaptive, changing as the user clicks from node to node, to minimize cluttering. Nodes can contain any content or links to other nodes or content. There is a "focus" node, and users change focus from node to node. The algorithm was developed by Michael Douma and colleagues at IDEA.org, starting in 2005. The layout algorithm is based on the work of Yee and his associates, and the underlying mechanics have been further described in papers and talks at conferences on Information visualization, on Museums and the Web, and on distance education. Early implementations include:
Current implementations
Web-based – A web-based platform for authoring and publishing node maps. is available as a Software as a service, built on Adobe Flash, provided with both free and paid versions by the original development team at IDEA.org, launched 2009. It has an open API. Received a "Best Website for Teaching and Learning" award in 2011 from American Association of School Librarians, and voted #edchat's 35 Best Web 2.0 Classroom Tools in 2010.
It has been used for presentations in professional conferences and meetings. There are third party guides, reviews regarding general usage, and instructional design. The web implementation allows embedding in a blog, and can also be run as a form of slide show where each node corresponds to a slide.
Multitouch – The first multitouch implementation of SpicyNodes was as part of the WikiNodes multitouch Wikipedia browser for the Apple iPad, and launched in April 2011.
