I want to write code to flash a color image of a person in a window for a short period of time. The duration of the flash is important, not the frequency of the flashes, which will be low and probably controlled by pressing a key. Ideally, the duration should be an integral number of frames, starting from 1 and increasing to a much larger number. With a 60 Hz monitor, one frame would be 0.0167 seconds. The images would be low to moderate resolution, e.g. 70K to 1 Mb Can this be done entirely in Pharo or would it be necessary to use the Unified FFI with operating system commands? If it can be done in Pharo, what are the classes needed to display an image filed in from the hard drive? I am using a 27 inch iMAC (10.11.6) with 4GHz, 8 GB ram, and AMD Radeon R9 M395X 4096 MB video card. Pharos is new to me but I wrote Smalltalk code with VisualWorks a few years back. Thanks very much. Lou Cleveland