This article is part of a larger research project that aims to identify a methodicalway of investigating iconicity in the immensely rich field of media, whichincludes art and other kinds of communication. The first part of the paperfocuses on the intimate connection between sensory perception and cognitionand sketches a basis for analyzing multimodal iconicity (which involves, forinstance, several sensory modes or several spatiotemporal modes). The secondpart scrutinizes Peirce’s notions of image, diagram, and metaphor and arguesthat these three types of iconicity should be seen as a continuum that rangesfrom sensorially ‘strong’ to ‘weak’ iconicity and from cognitively ‘simple’ to‘complex’ iconicity. The third part of the paper analyzes some examples ofmultimodal iconicity, with specific emphasis on spatiotemporal multimodality(for instance, spatial signs representing temporal objects, such as graphsrepresenting population growth); earlier semiotic research has not dealt with thissubject in a systematic way.