ABSTRACT The rapid development,of large interactive wall displays has been accompanied,by research on methods that allow people to interact with the display at a ,distance. The basic method ,for target acquisition is by ray castinga cursor from one’s pointing finger or hand,position; the problem ,is that selection ,is slow ,and error- prone with small targets. A better method,is the bubble cursorthat resizes the cursor’s activation area to effectively enlarge the target size. The catch is that this technique’s effectiveness depends ,on the proximity of surrounding ,targets: while beneficial in sparse spaces, it is less so when targets are densely packed together. Our method,is the ,speech-filtered bubble ray that ,uses speech ,to transform a dense ,target space into a sparse ,one. Our strategy builds on what ,people ,already do: people ,pointing to distant objects in a ,physical ,workspace ,typically disambiguate ,their choice through speech. For example, a person could point to a stack of books ,and say “the green one”. Gesture indicates the approximate location for the search, and speech ‘filters’ unrelated books,from ,the search. Our technique works ,the same ,way; a person specifies a property of the desired object, and only the location of objects matching,that property,trigger the bubble size. Ina controlled evaluation, people were faster and preferred using the speech-filtered bubble ray over the ,standard bubble ray and ray casting approach. Categories and Subject Descriptors H5.2 [Information interfaces and ,presentation]: User Interfaces., – Interaction Styles. General Terms