One axis (Y-Axis) ranks potential for disruption from high to low, while the other (X-Axis) is time ranked from sooner to later. Importantly, time relates to common usage or ubiquity, not initial invention. 
The 100 technologies (99 really) are divided into four groups. Horizon one technologies (green on the table) are new technologies that are happening right now. 
Horizon two technologies (yellow) are probable near future technologies (10-20 years). 
Horizon three technologies (red) are things that are likely to emerge in the more distant future (20 years plus). 
The outer edge of the table (grey) contains what has been termed Ghost Technologies.  This is fringe thinking territory with some ideas bordering on complete lunacy. However, while each example is highly improbable, very few, if any, are totally impossible.
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