Seems every time my daughter and I take up some space on the floor, out cat comes and butts in. She lays across the paper we are drawing on, lays across the book we are reading, lays on the game we are playing... So the other day she asked if we could make a "No Cat's Allowed" sign. I made one first so we could practice tracing letters. Then Ada made her own -her way.
So, we'll keep this sign around when the kitty is in the way. It seems to work.