Obstructed somehow by the interface, his standard programs failed to move him through the architecture at a reasonable pace. He tapped keys, improvising variations in a search for a compatible set of parameters. Frustrating minutes later, he finally realized that many of his tricks were inappropriate. Passwords and subroutines here would be strongly influenced by the imagery. Symbolically, not literally, for nothing was literal in the Matrix. He suspected that many programs in this system would have strategic orientations that could only be expressed in such a way as to manifest an appropriate construct imagery. A clever, if convoluted protection system. Any decker unwilling to accept the parameters of the imposed imagery would be paralyzed. But, as he had told uncounted admirers, he was not just any decker.