We report the discovery of two new light echoes from sheets of material behind supernova 1987A and present images of the progenitor's circumstellar shell. These data also indicate diffuse echoes from the star's red giant wind. The echo sheets' geometry explains well the behavior of SN 1987A's 10 micron flux, but the circumstellar shell appears to be 70% larger than the prediction from the analysis of narrow UV emission lines. We use the sheets' recombination time to show that they are relatively thin and dense. Our data also constrain the existence of any fourth star in the Sanduleak -69^deg^202 system and show that the feature reported 8" from the supernova is probably not an echo from a thin sheet in SN 1987A's foreground.
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Crotts et al. (1989) studied this question.