Affirm displays living love affirmations.  Can be configured to show any
affirmations.  The command line takes four integers, the times are in
milliseconds.
minOn maxOn minOff maxOff
minimum and maximum times to show the affirmation and the
minimum and maximum times to show nothing.  You can
configure these short enough to be subliminal if you want.
It will display a random length of time between these two bounds.
A millisecond is 1/1000 of a second.
The original story of subliminal framed embeddedd in a movie that made
people buy popcorn and Coke turned out to be a hoax.  It reputedly showed
the image for 1/24 of a second, too fast to register consciously.  Affirm
lets you show the image much longer so that you can notice it, over even
read it clearly.