(PUT-IMAGE new-upper-left-point image-string put-mode)

Rewrites (very quickly!) the whole image saved in image-string, with the upper left corner at new-upper-left-point. You can use various displaying methods:
{\itt 'COPY}
{\itt 'XOR}
{\itt 'OR}
{\itt 'AND}
{\itt 'NOT}
This function can be used to animate a small shape on the screen.